The SLN S63 Ceramic Coated Decat Downpipes represent the ultimate choice for unlocking the true power and acoustics of the twin-turbo 4.4L V8 engine found in Pre-LCI BMW M5 (F90) and M8 (F91/F92/F93) models. By completely removing the restrictive primary factory catalytic converters, this straight-through decat design provides maximum exhaust flow velocity directly off the turbo exhaust housings.

Each set features a premium thermal barrier ceramic coating. This specialized space-age coating insulates the downpipes, locking heat inside the exhaust stream to accelerate gas velocity while dramatically dropping engine bay temperatures—protecting sensitive wiring harnesses, plastics, and accessories from thermal fatigue. The sound signature is radically altered into a crisp, deep, motorsport-derived V8 bark under throttle.

Part Number: SLN_F90_DC

Key Features

– Straight-through decat design for absolute unrestricted exhaust gas scavenging
– Advanced thermal ceramic coating drastically lowers engine bay surface temperatures
– Cast stainless steel turbo connections ensure smooth transitions and zero turbulence
– Hand-TIG welded high-grade stainless steel base construction for structural longevity
– Precision engineered to mount seamlessly to original turbo flanges and factory cat-back exhaust

Benefits

– Massive horsepower and torque gains when paired with appropriate engine management software
– Noticeably faster turbo spool-up, sharper throttle response, and reduced lag
– Delivers a raw, aggressive, and incredibly deep twin-turbo V8 tone
– Advanced heat insulation keeps critical engine components cool under extreme driving load

Dimensions

– Base Material: High-grade performance stainless steel alloy
– Coating: Advanced multi-layer thermal barrier ceramic matrix
– Finish: Matte black thermal ceramic

FAQ

Q: Will these downpipes trigger a Check Engine Light (CEL)?
A: Yes. Because these downpipes completely delete the factory primary catalytic converters, the vehicle will detect the missing filtration elements and trigger a CEL. A proper ECU recalibration, stage 2 tune, or hardware simulator is required to clear it.

Q: Are these suitable for LCI models?
A: No, this specific part number is engineered strictly to fit the slip-on flange style or physical layout found on Pre-LCI models built between 2018 and 2020. They do not fit 2021+ facelifted (LCI) variants.

Q: Why is ceramic coating important on a downpipe?
A: The S63 engine features a "hot-V" configuration where the turbos and downpipes sit right in the center of the engine bay. Ceramic coating blocks immense amounts of radiant heat from escaping into the engine bay, keeping intake temperatures lower and preventing engine components from degrading due to heat soak.

Fitment

– BMW F90 M5 Pre-LCI (2018-2020)
– BMW F90 M5 Competition Pre-LCI (2018-2020)
– BMW F91 M8 Convertible Pre-LCI (2019-2020)
– BMW F92 M8 Coupe Pre-LCI (2019-2020)
– BMW F93 M8 Gran Coupe Pre-LCI (2019-2020)
Note: Designed exclusively for Pre-LCI S63 engine platforms. Not compatible with newer LCI vehicles.

If you are unsure on fitment, please message us with your registration or VIN and we will confirm compatibility before purchase.