Free assessment first
A 15-minute Powerflow appointment is required before quotation so the real vehicle, condition and packaging can be inspected.
Powerflow · Sandhurst
A custom exhaust, built on your vehicle.
Every Powerflow enquiry starts with a free, no-obligation 15-minute assessment. We inspect the vehicle on the ramp, discuss the system, tailpipe and sound options, then prepare an accurate quotation.
TM / 26304 gradeStainless fabrication
3 choicesSystem · tailpipe · sound
FreeInitial assessment
/ 01
Start with the goal
Tell us how you want
the car to feel.
Custom exhaust work cannot be quoted accurately without seeing the vehicle. The assessment lets our fabricators check the existing system, routing, emissions hardware, clearances, bumper layout and any OEM valves before recommending a back-box, rear section, cat-back, downpipe-back or fully bespoke route. If you are unsure which stage, part or package applies, that is exactly what the first conversation is for.
Capability
What we can build into it.
System extent
Back-box, rear section, cat-back, downpipe-back, full system, flexi repair or a targeted bespoke section.
Single or dual route
Single-exit, twin-exit, single-pipe, dual-pipe and suitable crossover layouts shaped around available space.
Silencers & resonators
Box size, count and position are selected around tone, cruising refinement, volume and drone control.
OEM valve integration
Existing factory valves can be assessed for retention and integration; alternative valve solutions depend on compatibility and the agreed control route.
Tailpipe finish
Diameter, shape, finish, projection and bumper position agreed before the final presentation is completed.
See it, don't just read it
Workshop detail you can explore.
01 / Powerflow · SandhurstA custom exhaust, built on your vehicle. in focus
02 / Air & fuelAirflow, fuelling and ignition hardware viewed as one systemOpen route ↗
03 / Boost & coolingForced induction and thermal control planned togetherOpen route ↗
04 / ChassisBrakes, suspension, wheels and tyres matched to the vehicleOpen route ↗
05 / DrivetrainDrivetrain and engine hardware in real workshop detailOpen route ↗Drag, swipe or use the arrows · advances automatically
Good to know before you book
Clear scope. Helpful answers.
Materials, bore and packaging
- We fabricate in mild steel and 304 stainless steel. Custom titanium fabrication is not offered; suitable pre-built titanium systems can be assessed for installation.
- Available pipework options span 1.5 to 3 inches, selected around the engine, routing, ground clearance and desired result.
- Single or dual layouts, tailpipes, factory-valve retention and the required emissions equipment are discussed during the free 15-minute assessment. Final availability and price follow inspection.
Choose the silencer around how you use the car
- Straight-through packed silencers use sound-absorbing packing around the flow path. Chambered designs use internal routing and chambers to influence the sound.
- Body volume, length, bore, number of boxes and their position all affect tone and cruising refinement. A larger silencer generally offers more scope for attenuation, but the complete system and vehicle still matter.
- Round and oval bodies, centre or offset connections and single or twin outlets provide different packaging options. Not every combination fits every vehicle.
- Bring a sound reference if helpful, but tell us about motorway use, towing, cold starts and cabin drone as well as the noise you want outside.
Catalysts and front sections
- Catalyst selection considers the engine, output, available space, substrate, sensor locations, temperature and emissions requirements—not a power rating alone.
- We retain the necessary road-use emissions equipment and confirm the correct application before recommending a catalyst or front section.
- A generic sports-catalyst description is not a guarantee of compatibility or an MOT pass.
The detail, already open
The complete route, on your terms.
Every guide is expanded by default so the full scope is visible immediately. Compatibility and outcome still depend on the exact vehicle, software, condition and installed parts.
GUIDE / 01Choose the system
The starting point is how much of the exhaust needs to change.
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Choose the system
The starting point is how much of the exhaust needs to change.
- Full system
- Cat-back system
- Rear section or back-box
- Targeted pipe, flexi or manifold solution
- Sound, refinement and road-use priorities agreed before fabrication
GUIDE / 02Choose the finish
The visible end of the system is designed with the vehicle, not in isolation.
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Choose the finish
The visible end of the system is designed with the vehicle, not in isolation.
- Wide range of tailpipe styles
- Twin, oval, slash-cut and other suitable formats
- Position and projection agreed before final finish
- Single or multi-exit layout where packaging allows
- Appearance checked against bumper and body lines
GUIDE / 03Choose the sound
Silencer and pipe choices shape tone as well as volume.
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Choose the sound
Silencer and pipe choices shape tone as well as volume.
- Near-standard refinement
- Sporting road note
- More purposeful character where suitable
- Cruising comfort and drone considered
- Engine, catalyst and layout acknowledged as influences
GUIDE / 04Materials and vehicles
Fabrication is carried out directly on the vehicle for an accurate route.
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Materials and vehicles
Fabrication is carried out directly on the vehicle for an accurate route.
- Mild-steel and 304 stainless fabrication; no custom titanium fabrication
- Cars, vans and 4x4s
- Classics, sports and rally cars
- Motorhomes, mobility and specialist vehicles
- Free initial workshop assessment before an accurate estimate
Powerflow system planner
See every choice from front pipe to final tip.
The full-width visual follows the exhaust from the engine-side connection to the final tailpipes. Select or hover over a numbered marker to match the physical component with the detailed consideration directly below.
FRONT / ENGINE SIDEREAR / TAILPIPE SIDE
01—04Front connection to centre section
Front connection & downpipe
We inspect the existing manifold or turbo outlet, flange, sensors and emissions hardware. A Powerflow build can begin behind the compliant front section or connect to suitable existing hardware.
Flex section & transitions
A correctly positioned flexi allows controlled powertrain movement. Diameter changes, reducers and joins are shaped to preserve clearance and avoid a stressed front connection.
Catalyst, DPF, GPF & sensors
Road-going emissions equipment and required sensors remain part of the design. Condition, temperature, location and access are checked before a route is agreed.
Centre pipe & crossover
Single or dual pipework can use a straight, resonated, X-pipe, H-pipe or independent-bank layout where the vehicle, packaging and sound target genuinely suit it.
05—08Sound control to final presentation
Resonators & silencers
Quantity, body size, position and internal construction shape volume, tone, drone control and motorway refinement. Bigger or fewer is not automatically better.
OEM or aftermarket valves
Existing factory actuators may be retained where position, electronics and fail-safe operation permit. Alternative valved routes depend on compatible controls and the agreed use.
Rear split & tailpipes
Single, twin or quad presentation; round, oval or slash-cut profiles; polished, dark or specialist finishes. Projection, spacing and bumper symmetry are agreed before completion.
Hangers, clamps & welds
Stainless hangers, serviceable joints, movement, ground clearance, heat protection, neat TIG fabrication and accessible fixings all contribute to a system that lasts and remains maintainable.
Vehicle architecture changes the answer
Four common starting routes.
Your car may use one pipe, two banks, an OEM valve, unusual underbody packaging or only need a rear section. The ramp assessment establishes the technically sensible route before any quotation.
Single route
A compact path for many four-cylinder cars, classics, vans and packaging-limited applications. Pipe diameter, resonation and silencer volume are selected for the engine and sound brief.
True dual or crossover
Separate banks may use an X-pipe, H-pipe or independent route. Balance, tone, scavenging, heat, available space and ground clearance determine the useful design.
OEM-valve integration
A factory valve can be inspected for retention and correctly positioned in the new system. Compatibility, actuator travel, control behaviour and fail-safe operation are confirmed on the vehicle.
Rear-section solution
Where the front and centre system are sound, a back-box or axle-back route can change presentation and tone without replacing more of the vehicle than necessary.
How much is being built?
- Targeted flexi or damaged-section repair
- Back-box or axle-back section
- Cat-back or downpipe-back system
- Complete specialist route where appropriate
How should it behave?
- Near-standard, subtle, sporty or more assertive tone
- Cold-start and low-speed volume
- Cruising refinement and drone control
- Valve or non-valved operation where suitable
How should it look?
- Single, twin or quad exit
- Round, oval, slash-cut or rolled profile
- Polished, dark or compatible specialist finish
- Diameter, projection and bumper position
What must it live with?
- Daily driving, motorway work, towing or specialist use
- Ride height, speed humps and ground clearance
- Heat, suspension travel and powertrain movement
- Road legality, insurance and MOT requirements
Workshop process
Plenty of explanation. No pressure.
Every vehicle is different, but you should always understand what is being recommended and why.
01 · Understand
Every vehicle receives a free workshop assessment for an accurate estimate.
02 · Specify
System, tailpipe and sound are agreed before fabrication.
03 · Deliver
The system is made on the vehicle and checked for fit and finish.
Fit for purpose
Who this route is built for.
The useful question is not simply whether a part or calibration is available. It is whether it supports your car, your driving and the next stage of the build.
- Vehicles without a suitable off-the-shelf system
- Owners wanting control over tone, tailpipe and section layout
- Classics, vans, motorhomes and specialist packaging requirements
- The vehicle is assessed on the ramp before a firm fabrication estimate
- Sound is influenced by engine, catalyst, pipe diameter and silencer design
- Adequate clearance and movement are designed into the finished system
Why Torque Monsta
Serious about the work.
Easy to talk to.
Performance work should come with honest limitations, professional tools and a clear explanation of what your money changes. Our approach joins calibration and fabrication knowledge with the wider mechanical capability of Vulcan Motors.
Custom calibration
Vehicle, software, fuel and hardware are considered together rather than assuming one file fits every example.
Genuine tools
Professional, legitimate tooling and processes support safer reading, writing, coding and diagnostic work.
IMI accredited
Recognised automotive training and standards sit behind the practical workshop experience.
Fully insured
The workshop operates as an established automotive business with the appropriate professional cover.
Transparent scope
Parts, labour, calibration and likely follow-on requirements are discussed before the project grows.
Parts and fitting
Explore our separate parts shop → · Ask the workshop to confirm compatibility and installation.
Before you commit
Performance with the whole car in mind.
Power, sound and appearance are only part of a successful result. Reliability, braking, tyres, heat management, servicing, insurance and road use all deserve a place in the conversation.
Vehicle healthParts compatibilityRoad useFuture stagesMaintenanceLegal obligations
Why does a custom exhaust need a free assessment?
The vehicle must be seen on the ramp to understand space, routing, condition, clearances and the amount of fabrication. That assessment allows the system type, tailpipe, sound and accurate estimate to be agreed.
What vehicles can be considered?
The current offering covers cars, vans, classics, 4x4s, sports and rally cars, motorhomes, mobility and other specialist vehicles, subject to an in-person assessment.
Can you repair only part of an exhaust?
Yes, where the remaining system is suitable. Flexi sections, manifolds, pipework and targeted custom sections can be assessed as alternatives to a complete build.
Do I need to pay a deposit?
Torque workshop jobs, including Powerflow fabrication, require a 50% deposit before parts ordering or confirming the work booking. The initial free Powerflow assessment remains free and no-obligation. Ask for the written payment and cancellation terms before paying; statutory rights are unaffected.
How will you keep me updated?
We use phone, WhatsApp or email, with written confirmation of changes to project cost or scope. Photos and progress updates can be requested. Parts availability, additional findings and agreed milestones affect the programme.
Will this work on my exact vehicle?
Compatibility depends on registration, model year, engine or transmission code, software and current modifications. Send those details and we will confirm the appropriate route before booking.
Do you provide fixed prices?
Straightforward packages can often be quoted in advance. Bespoke builds, fabrication and diagnostic work are estimated after the vehicle and required parts have been properly scoped.
Will modification affect insurance or warranty?
It can. Modifications should be declared to the insurer, and manufacturer or third-party warranty coverage may be affected. We recommend confirming your position before authorising work.
Can I supply my own parts?
Often, subject to inspection, suitability and workshop agreement. We cannot guarantee the quality or compatibility of customer-supplied parts, and additional labour may apply if they do not fit as expected.
What happens before handover?
Fabricating directly on the vehicle allows the routing and presentation to be resolved around its real underside rather than a generic diagram. The installed system or calibration is checked, and we explain relevant operation, bedding-in, maintenance or follow-up advice.
Build a better brief
What to include in your enquiry.
The more complete the starting information, the more useful our first recommendation can be. Photos, part numbers and diagnostic reports can be added after the initial contact where helpful.
Registration or VIN, mileage, transmission and exact model or engine variant.
Software, engine hardware, exhaust, suspension, wheels, tyres and any recent repair work.
Power delivery, sound, appearance, road use, track use, towing, economy or a specific problem to resolve.
Budget range, preferred timing, comfort requirements, insurance restrictions and future stages.
Fuel grade, typical journey, annual mileage and whether the vehicle is a daily driver or specialist project.
Questions are welcome
Talk through the car.
Leave with a route.
Keep for laterPowerflow guarantee & aftercare
Open for cover, exclusions, looking after your system and arranging an inspection.
Powerflow guarantee & aftercare
Open for cover, exclusions, looking after your system and arranging an inspection.
What the guarantee covers
- The Powerflow stainless steel exhaust-system guarantee applies for as long as you remain the registered keeper and the vehicle remains roadworthy, subject to the written conditions.
- Flex couplings and knuckle joints, catalytic converters, manifolds/front pipes and rubber mounts have 12-month cover rather than lifetime cover.
- Workmanship claims are handled by the original fitting dealer. Keep the original invoice and vehicle registration document; contact reception first so an inspection can be arranged.
- Impact damage, contamination, competition/circuit use and later third-party modification can affect cover. Read the full guarantee for its scope and exclusions; your statutory rights are unaffected.
The written lifetime terms apply to the Powerflow stainless steel system. If you are choosing mild-steel work or a repair to an existing system, ask us to confirm the applicable cover before authorising it.
Looking after the system
The written Powerflow guarantee does not require special exhaust maintenance. Continue maintaining the vehicle in accordance with its manufacturer’s instructions and retain your servicing records.
Let us know about new rattles, leaks, changes in sound or impact damage. Engine condition, excessive vibration, worn mounts and contamination can affect the exhaust and its cover.
Surface discolouration or corrosion that does not cause leakage is not included in the written guarantee. Ask us about any particular finish-care instructions at handover.
If something needs attention
Contact reception first with your registration, original invoice and a description of the concern. Inspections are by appointment. The original fitting centre handles welding and workmanship claims; the written document explains the alternative-depot route when returning is impractical.
Have the vehicle registration document available. Evidence of routine maintenance or an MOT certificate may be requested in relevant cases. Catalyst claims are subject to the evidence requirements in the full document.
Do not arrange third-party alterations or repairs and assume the Powerflow guarantee will pay for them. Third-party changes or repairs can invalidate the guarantee; speak to the fitting centre first.
Read the complete conditions
This is a customer guide to the supplied Powerflow guarantee, not a replacement for its full conditions. Specific items and invoice exclusions may differ from the lifetime system cover. Your statutory rights are unaffected.
Open the full Powerflow guarantee (PDF) ↗Contact reception · 01252 870818 · Option 1