ApexBuilt® BMW F90 M5 & F92/F93 M8 GESI High-Flow Catted Downpipes (S63R, 2018+)

From $1,528.00
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ApexBuilt® F9X M5/M8 GESI High-Flow Catted Downpipes offer...

  • No check engine light on factory-tuned vehicles.
  • 49 state emissions legal*• Industry-leading build quality.
  • Perfect fitment, guaranteed.
  • Drastically improved throttle response, quicker turbo spool, and an aggressive exhaust note versus OEM.
  • Estimated gains of 20-25+ wheel horsepower and 40-50+ TQ when installed on a vehicle that is not tuned.
  • Estimated gains of 45+ HP and 60+ TQ over stock power levels when paired with an aftermarket ECU tune.
  • TIG-welded T304 stainless steel construction, assembled by hand in Fort Myers, FL.
  • EPA approved GESI GEN2 UHO metal-core 400cpsi 4.5" cats, rated for 500-800hp applications & road legal in 49 states. 
  • Lifetime warranty.


These downpipes will not be sold or shipped to the state of California. GESI 400cpsi cats are EPA approved, but not CARB approved – meaning they're street legal in all 49 states EXCEPT the state of California. Read more about GESI cats: https://gsportbygesi.com/high-performance-catalytic-converters/g-sport-catalytic-converter-technology/ 

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Fitment supported for the following vehicles:

• BMW F90 M5   (01/2016 — Current)
• BMW F91 M8   (11/2017 — Current)
• BMW F92 M8   (11/2017 — Current)
• BMW F93 M8   (10/2018 — Current)

*Base, Competition, and CS trims all supported