ApexBuilt® BMW B58 Gen 1 GESI High-Flow Catted Downpipe (2016-19)

From $1,199.99
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ApexBuilt® BMW B58 Gen 1 High-Flow Catted Downpipes offer...

• Industry-leading build quality.
• Perfect fitment, guaranteed.
• Drastically improved throttle response, quicker turbo spool, and an aggressive exhaust note versus OEM.
• GESI 400 Cell cats, 49 state emissions compliance
• Estimated gains of 20-25+ wheel horsepower and 30-35+ TQ when installed on a vehicle that is not tuned.
• Estimated gains of 45+ HP and 50+ TQ over stock power levels when paired with an aftermarket ECU tune.
• TIG-welded T304 stainless steel construction, assembled by hand in Naples FL.
• Lifetime warranty.


These these parts are for OFF ROAD / RACE USE ONLY. We advise you to run a tune on your vehicle for best results.
As of June 6, 2024 – estimated production lead time of 6-8 weeks if product is not in stock 


Fitment supported for the following vehicles:

• BMW F22/F23 M240i (2016 — 19)
• BMW F30 340i (2015-18)
• BMW F32/F33 440i (2015-19)
• BMW F34/F36 440i (2015-19)(GT also included)
• BMW G30/G31 540i (2017-18)

*xDrive models also supported