Stone Exhaust BMW S63M F90 F91 F92 F93 Catless Downpipes for M5 and M8
Upgrade your BMW M5 or BMW M8 with Stone Exhaust catless downpipes and unlock serious exhaust flow, response and sound. Engineered specifically for the BMW S63M twin turbo V8 in the F90 M5 and F91 F92 F93 M8, these catless downpipes are designed for enthusiasts who want maximum performance potential, sharper response and a more aggressive exhaust note from their M car. If you are searching for BMW M5 downpipe, BMW M8 downpipe, S63 downpipes, S63M catless downpipe, F90 M5 decat, F92 M8 decat, OPF downpipe or non OPF downpipe, this is the high quality solution that fits right and performs.
Why choose Stone Exhaust catless downpipes for your BMW M5 and M8
- Catless downpipes purpose built for BMW M5 and BMW M8 with the S63M engine platform
- Optimised exhaust gas flow using 3D flow velocity analysis to reduce restriction and back pressure
- One piece bend design to eliminate unnecessary welds in critical flow paths
- 100 percent OEM fitment for F90 M5 and F91 F92 F93 M8 chassis
- Machine welded with mechanical welding arms for precision and clean internal welds
- Crisscross and overlapping welding at the turbo flange to handle extreme heat and stress
- In house research and development, 3D scanning and reverse engineering of OEM parts
- Built for reliability, durability and repeatable performance
We use these Stone Exhaust downpipes on customer cars and in our own builds. Fitment is spot on, quality is first class and feedback has been consistently brilliant. If you want a BMW M5 downpipe or BMW M8 downpipe that simply fits and delivers, this is the one.
Engineered for flow and reliability
Stone Exhaust combines 3D simulation of exhaust gas flow, temperature and pressure with advanced manufacturing to maximise efficiency. The one piece bent pipe design reduces turbulence caused by multiple joints, improving exhaust velocity and helping the turbos breathe more freely. Results include reduced back pressure, stronger response and a more pronounced, motorsport inspired exhaust tone when paired with appropriate tuning.
7 axis CNC bending
Constructed on a 7 axis CNC bending machine for aerospace grade accuracy. Stone achieves an impressive 98 percent roundness with only 25 percent outer bore wear at 180 degrees. Combined with reverse engineering and 3D scans, the integrally moulded pipe achieves an accuracy error under 0.025 mm, helping avoid airflow obstruction and welding fracture issues common on lesser downpipes.
Turbo flange strength
The turbo to downpipe flange sees extreme temperatures. Stone uses crisscross and overlapping welding techniques to increase weld width and penetration at these critical points, improving endurance and long term reliability under repeated heat cycling.
Compatibility
Engine: BMW S63M twin turbo V8
Models:
- BMW F90 M5, M5 Competition, M5 CS
- BMW F91 M8 Convertible
- BMW F92 M8 Coupe
- BMW F93 M8 Gran Coupe
OPF and non OPF options
- A221P - Non OPF
- A221NPG - OPF
Manufacturing details
- One piece design for smooth internal flow
- Machine welded for precision and clean internal surfaces
- Direct spot welding in key areas for strength
- Reverse engineered via 3D scanning for perfect OEM fitment
Fitting and support
Professional installation recommended. We offer full fitting services at Nforcd in Warwickshire with in house expertise on the BMW S63M platform. For a tailored fitting quote, email Sales@nforcd.com.
Part numbers
- A221P Non OPF
- A221NPG OPF
Manufacturer and warranty
Manufactured by: Stone Exhaust
Warranty: Stone Exhaust 2 year warranty
Buy with confidence from Nforcd
Tried, tested and loved by our team and customers alike. Expect excellent OEM fitment, robust build quality and flow optimised design that gets the best from your S63M when combined with suitable software. Order your BMW M5 or BMW M8 catless downpipes today.
Common search terms
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