Masata BMW S55 Catless Downpipes - Fits M2 Competition F87 LCI, M3 F80, M4 F82/F83 - High-Flow Decat 304 Stainless, OEM Fit, Stage 2 Ready

Masata S55 Test Pipes for BMW M2 Competition, M3 and M4

Unlock serious performance and a sharper soundtrack from your twin‑turbo S55 with these Masata race downpipes. Designed for the F80 saloon M3, F82 coupé M4, F83 cabriolet M4 and F87 LCI M2 Competition, this decat upgrade replaces the restrictive factory catalytic converters to maximise flow, improve turbo spool and add a deeper, more motorsport‑inspired tone. Built from premium T304 stainless steel with a reinforced turbo flange and an OEM‑style soft flex section, the Masata solution installs cleanly and delivers rock‑solid reliability on both stock and tuned cars.

We have installed these on our own S55 projects and multiple customer vehicles. Fitment is precise, the finish is excellent and feedback on drivability and sound has been outstanding. If you are chasing more power, quicker response and a tougher exhaust note, this is the go‑to hardware for your BMW M car.

Key reasons enthusiasts choose this setup

• Free‑flowing decat design for minimal backpressure and smoother exhaust gas velocity
• Stage 2 ready with typical gains of 60 to 70 bhp and 70 to 80 lb ft when paired with appropriate calibration
• One‑piece construction to reduce weld joints and potential weak points
• T304 stainless steel tubing and a strengthened turbo outlet flange for durability
• OEM‑style soft flex bellow to manage heat expansion and reduce vibration transfer
• Neat welding at the turbine flange and a smooth internal finish
• Direct bolt‑on fit to factory or any cat‑back that mates to the stock downpipe position
• Richer, more purposeful exhaust character on the M2C, M3 and M4

Design that works

The Masata layout uses smooth radius bends and a single‑piece tube to cut turbulence and keep flow consistent right out of the turbos. The flex section mirrors the factory approach to control movement from heat cycles, helping protect the flange area from stress. The result is a robust pipe set that withstands hard use while letting the S55 breathe as intended.

Tuning and supporting hardware

For best results, pair with a suitable Stage 2 map such as a Bootmod3 BM3 calibration to fully realise the airflow benefits and manage emissions‑related codes. We recommend replacing the turbo side and mid‑pipe side gaskets during installation on all S55 models.

Vehicle compatibility

• BMW M3 F80 saloon with S55 engine
• BMW M4 F82 coupé and F83 convertible with S55 engine
• BMW M2 Competition F87 LCI with S55 engine

Suits non‑OPF and non‑GPF cars. Not suitable for September 2018 onwards vehicles equipped with a particulate filter.

Fitting and support

Professional installation recommended. For supply and fit, book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quotation and advice on calibration and supporting parts for your build.

Part number

MST0014

Manufacturer and warranty

Manufactured by Masata
Masata Lifetime Warranty

Search terms our customers use

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Intended for motorsport and off‑road use where local laws permit. Please check regulations in your area.