ApexBuilt® B58 400 Cell High-Flow Catted Downpipe – BMW/GR Supra (B58/B58TU, 2016-2025)

ApexBuilt® High-Flow Catted Downpipes for BMW B58 engines deliver exceptional performance and quality... • Industry-leading build quality ensures durability and reliability. • Perfect fitment is guaranteed for a hassle-free installation. • Experience drastically improved throttle response, quicker turbo spool, and an aggressive exhaust note compared to OEM systems. • Equipped with EURO5-spec, 400 cell catalysts • Enjoy estimated gains of 15+ wheel horsepower and 25+ TQ on vehicles that are not tuned. • When paired with an aftermarket ECU tune, expect impressive gains of 30+ HP and 40+ TQ over stock power levels. • Crafted from TIG-welded T304 stainless steel, each downpipe is meticulously assembled by hand in Florida. • Backed by a lifetime structural warranty for your peace of mind. PLEASE NOTE: These downpipes do not use EPA-compliant GESI catalysts. As a cost-effective alternative to our GESI catted variant, these downpipes instead utilize three-way, EURO5 rated, 400-cell catalysts.  We cannot guarantee catalyst inefficiency related codes (CEL) will not be present after install.  These parts are designed for OFF ROAD / RACE USE ONLY. We recommend running a tune on your vehicle for optimal results.