Airtec Motorsport De-Cat Downpipes for BMW S63B44TU deliver the ultimate exhaust upgrade for BMW M5 and M6 owners who want more performance, faster turbo spool and a harder, motorsport sound. By replacing the restrictive factory catalytic converters, these BMW M5 de-cat downpipes and BMW M6 decat downpipes dramatically reduce back pressure, improve flow and unlock power potential when paired with a suitable remap. Perfect for S63 twin-turbo V8 tuning, Stage 2 upgrades and track-focused builds.
These catless downpipes for the BMW S63 engine are engineered for performance and reliability. Airtec’s cast elbow design helps retain diameter and maintain smooth, high-velocity gas flow from the turbochargers, aiding response and overall efficiency. Made from stainless steel with smooth bends and finished with an AIRTEC laser-cut plaque, they integrate cleanly with the rest of the system and fit both OEM and aftermarket exhausts.
Why choose these Airtec Motorsport S63 decat downpipes
- De-cat, catless design for maximum flow and reduced back pressure
- Cast elbow to retain diameter and improve turbo efficiency
- High-quality stainless steel construction
- Smooth mandrel bends to optimise exhaust gas velocity
- AIRTEC laser-cut plaque detail
- Direct fit to original BMW exhaust and most aftermarket systems
- Improved performance further enhanced with an ECU remap, ideal for Stage 2 tuning
- More aggressive exhaust note and quicker turbo spool on the S63B44TU
We run these downpipes ourselves and our customers consistently report sharper throttle response, faster spool and a deeper, more purposeful exhaust tone. If you are searching for BMW M5 downpipes, BMW M6 downpipes, S63 de-cat downpipes, F10 M5 catless downpipes or Airtec Motorsport BMW downpipes in the UK, this is the proven upgrade that delivers.
Vehicle fitment
- BMW M5 F10 with S63B44TU
- BMW M6 F06 Gran Coupé, F12 Convertible, F13 Coupé with S63B44TU
Fitting and support
Nforcd offers professional installation and setup in Warwickshire. For a fitting quote or to discuss your BMW M5 or BMW M6 S63 build, email Sales@nforcd.com.
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Legal and compliance note: De-cat, catless downpipes remove catalytic converters. For off-road and track use only. Not road legal in the UK. Check local emissions and MOT regulations before purchase and installation.