Torque Monsta Buying Guide · Detailed guide
Exhaust Fitment & Configurations
Understand cat-back, resonated, non-resonated and downpipe options before choosing the sound, flow and road legality you need.
Measure first
What to measure or record
Record engine, body style, wheelbase, drivetrain, transmission, factory valve arrangement, current pipe outside diameter and flange/joint type. Photograph the underside and diffuser. For sound, decide separately on cold-start volume, full-load volume, cruising drone and tone—“loud” alone is not a useful specification.
Decision guide
Choose by intended use
Subtle road
Resonated cat-back, more silencing and retained emissions equipment for a deeper tone with controlled cruise noise.
Sporting road
Larger-bore or freer-flowing resonated system; balance character against motorway drone.
Maximum sound
Non-resonated or reduced silencing increases volume and can add rasp/drone; legality and neighbour impact matter.
Power-led build
Size the manifold/downpipe/system for engine output and turbo setup, then confirm mapping, emissions, heat management and ground clearance.
Understand what you are buying
Key terms explained simply
Axle-back
Rear section, mainly changing sound and appearance.
Cat-back
System after the catalyst; a common sound and flow upgrade.
Resonator
Targets frequencies to reduce rasp or drone.
Downpipe
Turbo outlet section that may affect emissions, mapping and heat.
Pipe diameter
Must match airflow and power target; bigger is not automatically better.
Choose the system type
An axle-back changes the rear section, while a cat-back replaces the system after the catalytic converter. Downpipes and manifolds sit further upstream and can affect emissions equipment, mapping requirements and road legality.
Resonated or non-resonated
Resonators reduce particular frequencies and cabin drone. Non-resonated systems are generally louder, but volume and tone also depend on engine, catalyst, pipe diameter and silencer design.
Fitment details
Confirm body style, wheelbase, engine, drivetrain, transmission and any factory performance pack. Some systems need a reducer, alternative diffuser, valve controller or model-specific mounting hardware.
Road use and tuning
Removing or changing emissions-control equipment may make a vehicle illegal for road use. Some hardware changes also require ECU calibration. Check the product instructions and current local regulations before ordering.
Straight answers
Frequently asked buyer questions
How loud will it be?
Engine, catalyst, OPF/GPF, resonators, pipe size, silencers and cabin insulation all matter. Compare clips from the same vehicle and exact configuration.
What is drone?
A sustained cabin resonance at a particular rpm and load. Outside volume alone does not predict it; resonator design matters.
Resonated or non-resonated?
Resonated is normally safer for road and motorway use. Non-resonated adds volume with greater risk of drone and rasp.
Will it add power?
A well-designed system can reduce restriction, but many rear-section changes mainly alter sound. Larger gains often require supporting hardware and calibration.
Will it pass an MOT?
Leaks, noise, warning lamps and emissions equipment matter. Removing required catalysts or filters can make the vehicle illegal for road use.
Information to have ready before ordering
These details help us confirm the right product and avoid preventable fitment mistakes:
- Registration, engine and model year
- Body style, wheelbase, drivetrain and transmission
- Catalyst, OPF/GPF and factory-valve status
- Pipe diameter, flange and joint type
- Bumper or diffuser style
- Desired cold-start, cruise and full-load sound
- Tolerance for drone and rasp
- Power target, mapping and road/track use