Wagner Downpipe, BMW B58 (OPF G-serie)

BMW B58.2 OPF Downpipe Kit – More Flow for Modern B58 Engines

If you’re looking to free up additional performance from your BMW or Toyota equipped with the B58.2 OPF engine, this Wagner Tuning downpipe kit is designed to do exactly that. Built from high-quality stainless steel and engineered for optimal exhaust flow, it helps reduce backpressure, improve turbocharger efficiency and unlock additional power and torque.

Available either with a high-flow 200 CPSI racing catalytic converter or as a catless version for motorsport use.

Features

• Designed specifically for BMW and Toyota B58.2 OPF engines
• Manufactured from premium SS304 (1.4301) stainless steel
• CAD-designed and flow-optimized construction
• 3.5-inch diameter design for improved exhaust gas flow
• Includes adapter for connection to the original exhaust system
• Two lambda sensor ports
• Available with 200 CPSI racing catalytic converter or without catalytic converter
• Direct-fit replacement for the original downpipe
• Reduces exhaust backpressure
• Helps lower turbocharger thermal stress
• Can improve throttle response, power output and torque
• 100% bolt-on fitment

Technical Specifications

• Material: SS304 stainless steel (1.4301)
• Pipe diameter: 3.5 inches
• Catalyst options: 200 CPSI racing catalyst or catless
• Lambda sensor ports: 2
• Part number: 500001037
• Replaces OEM reference: BMW 18329897313

B58 Fitment Note

When selecting a downpipe for a B58 engine, pay close attention to the connection between the downpipe and the rest of the exhaust system.

Earlier B58 applications found in many F-series vehicles typically use a straight slip-fit connection secured with a clamp. Most G-series models and OPF-equipped vehicles use a V-band style connection instead. This downpipe is designed for the later OPF-style V-band connection as shown in the product images.

Please verify the connection type on your vehicle before ordering.

Important Notes

• Only suitable for vehicles equipped with an OPF (Otto Particulate Filter)
• Check OEM part number compatibility before ordering
• Installation may trigger a DME fault code or check engine light
• Catless version is intended for motorsport and off-road use only where permitted by local regulations

Example Compatible Models

BMW M340i (G20/G21) 2020-
BMW 540i (G30/G31) 2019-
BMW 640i (G32) 2019-
BMW 740i (G11/G12) 2019-
BMW 745e (G11/G12) 2019-
BMW 840i (G14/G15/G16) 2019-
BMW Z4 M40i (G29) 2019-
Toyota Supra A90 2019-