Evolution Racewerks Sports Series 4.5" High Flow Catted Downpipe – BMW B58 F & G Chassis (Up to 2024)

OVERVIEW

Evolution Racewerks' Sports Series Metallic High Flow Catted Downpipe is designed for the B58 six-cylinder turbo engine, covering 2024-and-older F- and G-chassis cars: the M240i, 340i, 440i, M340i, M440i, 540i, 740i and 840i, the X3 M40i and X4 M40i, the X5, X6 and X7 xDrive40i, and the Z4 M40i. It replaces the restrictive factory downpipe with a 200 cell metallic catalytic converter and mandrel bent 4.5" to 4" piping that transitions smoothly into the rest of the exhaust.

The result is a higher maximum horsepower curve and a torque curve that hits faster, climbs higher and holds longer, with better throttle response and quicker turbo spool. The downpipe is built entirely from stainless steel, 100% TIG welded, and made in the USA, with a precision CNC machined turbocharger V-band flange. It works with the factory exhaust system or an aftermarket one.

Ceramic thermal coating is offered as an option. Its purpose is to keep heat from the exhaust gases inside the downpipe rather than radiating out, which lowers underhood temperatures and reduces heat absorption by nearby parts. Retaining that energy also keeps exhaust flow velocities up, lowering backpressure, and the coating adds corrosion resistance. ER's thermal coating resists up to 2000°F and is available in black only, because no other color survives that temperature.

SPECS

• Catalytic converter: high flow 200 cell metallic core
• Piping: mandrel bent 4.5" / 4" with a smooth transition into the exhaust system
• Construction: 100% stainless steel, 100% TIG welded, made in the USA
• Turbocharger flange: precision CNC machined V-band
• Finish: brush finish standard, polish finish optional
• Optional high temperature black thermal coating rated to 2000°F to reduce underhood temperatures; available in black only
• Optional additional O2 sensor bung for a wideband O2 sensor, supplied with a pre-installed plug
• Optional EGT sensor bung for EGT gauges, supplied with a pre-installed plug
• Compatible with the factory or aftermarket exhaust systems
• Track tested durability
• All hardware for a complete installation is included
• Warranty: Evolution Racewerks Limited Lifetime Warranty

PARTS INCLUDED

• Sports Series metallic high flow 200 cell catted downpipe
• All hardware required for complete installation, as supplied by Evolution Racewerks

TECH RESOURCES

Additional Parts Required

• None. Evolution Racewerks specifies no additional hardware for this part; all installation hardware is supplied and the downpipe mates to the factory or an aftermarket exhaust.

Installation

• Evolution Racewerks does not publish a downloadable installation guide for this downpipe. It bolts to the factory turbocharger V-band flange and reconnects to the factory or aftermarket exhaust using the supplied hardware.
• Contact Speed Logic for installation support or fitment questions.

Notes

• Off-Road Use Only. Not CARB legal.
• Fits single-turbo B58 cars up to the 2024 model year, F-chassis and G-chassis. 2025+ cars with the B58 Gen 3 (B58N) engine use a different downpipe. The vehicle list below follows Evolution Racewerks' published fitment; if your car is not listed, confirm fitment with Speed Logic before ordering.

PART NUMBER

• BM-EXH018SCAT — Evolution Racewerks catalog number, brush finish
• BM-EXH018PCAT — polish finish
• BM-EXH018TBCAT — black thermal coating

VEHICLE APPLICATIONS