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ApexBuilt® BMW G80 M3 & G82 M4 GESI High-Flow Catted Downpipes (S58, 2021+)

Sale price $2,699.99 Regular price $2,499.99

ApexBuilt® G8X M3/M4 GESI HFC 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 Naples FL.

EPA approved GESI GEN1 UHO metal-core 300cpsi 4.5" cats, rated for 500-800hp applications & road legal in 49 states. 

• Lifetime warranty.

*PLEASE NOTE:

These downpipes will not be sold or shipped to the state of California. GESI 300cpsi 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/