BMW F90 M5 S63M 3 inch Decat Downpipes 2018 onwards — premium stainless steel catless downpipes engineered for maximum performance, faster turbo spool and an aggressive exhaust tone. Ideal for Stage 1 and Stage 2 tuning on the twin-turbo S63 engine.
Key features
- Constructed from SS304 aircraft-grade stainless steel, TIG welded in house for strength and reliability
- True 3 inch stainless pipe straight from the turbo for sharper throttle response and faster spool
- Mandrel-bent design for optimal gas flow and maximum internal diameter without sacrificing mid-range torque
- Reduced exhaust backpressure and lower temperatures for improved engine efficiency
- Significant weight saving over the factory catalytic converters
- Finished in brushed stainless for a clean, durable look
- Factory V-band clamps interface perfectly with the turbo and mid-section
- Lifetime warranty for complete peace of mind
Real performance and sound
Tested by us and proven by happy customers, these BMW F90 M5 decat downpipes deliver noticeable power gains of around 40 to 50 bhp on stock mapping, with the potential for 150 to 180 bhp increases when combined with a quality Stage 2 map. Expect a deeper, more aggressive exhaust note with the crackles and bangs enthusiasts love, while remaining civilised and quiet on the motorway.
Fitment and compatibility
- BMW M5 F90 chassis 2018 onwards
- Engine: S63M twin-turbo V8
If your car is a later model equipped with a PPF, this will need to be coded out by your tuner to avoid fault codes. Speak to your chosen tuner if you are unsure, as earlier models did not have a PPF.
Installation and tuning
- Professional installation recommended. Feedback indicates an easy fit, though some exhaust systems can be tight
- We recommend adding Lambda or O2 sensor spacers to help prevent the engine management light in most cases
- For mapping, we recommend reputable tuners such as Wrench Studios and Evolve
Prefer us to handle fitting. Nforcd offers installation in Warwickshire. Request a quote via Sales@nforcd.com.
Why upgrade your BMW F90 M5 downpipes
- BMW F90 M5 decat downpipes for more power, torque and response
- S63M downpipes that free up exhaust flow and reduce backpressure
- 3 inch catless downpipes that enhance turbo spool and drivability
- Stainless steel, TIG-welded, mandrel-bent performance downpipes for durability
- Exhaust upgrade that unlocks Stage 2 tuning potential and a more aggressive sound
- Direct fit replacement using OEM V-band clamps for a secure, leak-free seal
Important information
- Track use or off-road use only. Removing catalytic converters is not road legal and will not pass an MOT
- PPF-equipped vehicles require software changes to prevent fault codes
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