Evolution Racewerks Competition Catless Downpipe – BMW 230i / 330i / 430i / 530i (B46)

OVERVIEW

The Evolution Racewerks Competition Series 4" Catless Downpipe is built for the BMW B46 four-cylinder turbo engine and fits 2016 and newer 230i, 330i, 430i, 530i, X3 30i and X4 30i models. Replacing the restrictive factory catalytic converter and downpipe frees up exhaust flow, which Evolution Racewerks measures at 14 to 16 whp and roughly 20 wtq on stock boost, rising to over 24 wtq with a software upgrade. Gains vary with the rest of the vehicle's modifications.

The downpipe uses mandrel bent 4" piping and 100% stainless steel construction, TIG welded in house. The turbocharger V-band flange and the ball joint flange are CNC machined, and the ball joint interior is straight-flow rather than the factory press-formed shape. A stainless steel flex section is retained so the exhaust system can move without loading the turbocharger and manifold, and the improved factory-style "ball" V-band connector keeps the part compatible with the factory or an aftermarket exhaust.

The B46 engine is found in all U.S. spec cars. This downpipe is different from the one used on the B48 engine found in EU / Asia spec cars, and the two are not interchangeable. You must order the correct downpipe for your car.

SPECS

• Horsepower gain: 14 to 16 whp average (varies with vehicle modifications)
• Torque gain: 20 wtq average on stock boost, up to over 24 wtq with a software upgrade
• Higher maximum horsepower curve
• Higher initial torque curve; torque arrives sooner, higher and holds longer
• Improved throttle response and faster turbo spool up
• Mandrel bent 4" piping for a smooth transition into the exhaust system
• 100% stainless steel construction
• 100% TIG welded
• Precision CNC machined turbocharger V-band flange
• Precision CNC machined ball joint flange with straight-flow interior
• Stainless steel flex section, as used by the factory, for proper exhaust movement
• Retains the factory "ball" type V-band connector, redesigned for better flow
• Finish: mirror polish or brushed
• Optional high temperature black thermal coating to reduce underhood temperatures
• Optional additional O2 sensor bung for a wideband sensor, supplied with a pre-installed plug
• Optional EGT sensor bung for an EGT gauge, supplied with a pre-installed plug
• Compatible with the factory or aftermarket exhaust systems
• Track tested durability
• Limited Lifetime Warranty

PARTS INCLUDED

• Competition Series 4" catless downpipe
• All hardware required for complete installation
• Pre-installed plugs for the optional O2 and EGT bungs when those options are ordered

TECH RESOURCES

Additional Parts Required

• None. Evolution Racewerks specifies no additional hardware for this downpipe; all installation hardware is supplied.
• Optional companion part: Evolution Racewerks BMW B46/B48 Charge Pipe Kit.
• Installer supplies normal hand tools, a vehicle lift or stands, and penetrating oil for the factory exhaust fasteners.

Installation

• Evolution Racewerks does not publish a downloadable installation guide for this downpipe. It installs as a direct replacement for the factory downpipe using the supplied hardware.
• Contact Speed Logic if you need installation support or a recommended installer.

Notes

• Off-Road Use Only. Not CARB legal.
• U.S. spec cars use the B46 engine; EU / Asia spec cars use the B48 and require the B48 version of this downpipe. Confirm your engine code before ordering.
• Choose the Build Date option from your car's production date, not its model year. BMW changed the downpipe bracket locations during 2020 production: 2016–09/2020 build cars have one bracket on top and one on the side (BM-EXH019 version); 10/2020+ build cars have one bracket on top and one on the very bottom (BM-EXH031 version). The two versions are not interchangeable. The production date is printed on the driver door jamb label. Contact Speed Logic with your VIN if you need help confirming your build date.

PART NUMBER

• BM-EXH019S — Brush finish, build date 2016–09/2020
• BM-EXH019P — Polish finish, build date 2016–09/2020
• BM-EXH019TB — Ceramic thermal coating (black), build date 2016–09/2020
• BM-EXH031S — Brush finish, build date 10/2020+
• BM-EXH031P — Polish finish, build date 10/2020+
• BM-EXH031TB — Ceramic thermal coating (black), build date 10/2020+

VEHICLE APPLICATIONS