Transform your BMW with the Redstar B58N/B58X Downpipe, purpose-built for the B58B30M2 engine used across the latest M340i/M340iX, M440i/M440iX, M540iX/550eX, 735i/740i/740ix/750eX/M760eX, X3 M50, X5 40i/40iX/50eX, X6 40iX, X7 40iX and XM 50e models. Replacing the restrictive factory catalyst or OPF section directly after the turbo, this performance exhaust upgrade is engineered to free up exhaust flow on G20 LCI, G21 LCI, G22, G23, G26 LCI, G60, G61, G70, G45, G05, G06, G07 and G09 platforms.

A flow-optimised smooth-transition design reduces backpressure to sharpen throttle response, promote faster turbo spool and unlock a noticeable increase in power. An OPF delete configuration is available, and RedstarÕs OEM-style heat shielding option cuts radiant exhaust heat by up to 80% to help manage under-bonnet temperatures and support long-term component reliability. The result is a crisper, more assertive exhaust note with enhanced drivability.

Manufactured from high-grade 2.0 mm wall 304 stainless steel, each Redstar downpipe is 100% TIG welded and back purged for strength and consistency, and interfaces to the system using an OEM-spec V-band flange. Designed as a true bolt-on upgrade, Redstar downpipes integrate with factory mounts and deliver the brandÕs hallmark balance of performance, quality and durability for enthusiasts seeking premium downpipes and performance exhaust solutions.

Available Options

• HJS HD 200cpsi Catalytic Converters: Engineered in Germany and trusted worldwide, the HJS 200cpsi ultra high-performance cats are rated for over 1000hp. Renowned for exceptional flow, durability, and consistent quality, these converters set the benchmark for high-output applications. Ideal for drivers demanding maximum performance without compromise.
• GESI GEN2 400cpsi Catalytic Converters: The latest GEN2 series from GESI is rated to support up to 1000hp while offering smoother exhaust flow and improved efficiency compared with factory units. Featuring advanced emissions technology for optimal catalyst function at high flow rates. A strong choice for those seeking significant performance gains with refined operation.
• OEM-Style Heat Shielding: Redstar's signature thermal management system reduces radiant exhaust heat by up to 80%. Developed with motorsport-inspired materials and construction, it uses a multi-layer design of ceramic insulation and embossed stainless steel foil. Unlike wraps or coatings that degrade quickly, Redstar shielding delivers long-term durability and consistent protection for engine bay components.

Key Performance Benefits

• Noticeable power and torque gains from reduced exhaust backpressure
• Faster turbo spool and sharper throttle response
• Lower engine bay temperatures for improved component protection
• Deeper, more assertive exhaust note
• Direct bolt-on fitment using factory mounting locations

Technical Specifications

• Highest quality 2.0 mm wall 304 stainless steel construction
• 100% TIG welded and back purged
• OEM-spec V-band flange
• All brackets and mounts replicate the OEM unit
• Flow-optimised smooth transition design
• Optimised for the OE system layout

Notes

• OPF delete version available with additional threaded bungs for thermocouple and pressure tubes
• Slip on and V-band downpipe connection styles available
• EURO 6 compliant when configured with HJS HD 200cpsi catalytic converters

Fitments

• 2025+ BMW M340i/M340iX G20 LCI/G21 LCI
• 2025+ BMW M440i/M440iX G22/G23/G26 LCI
• 2025+ BMW M540iX / 550eX G60/G61
• 2025+ BMW 735i/740i/740ix/750eX/M760eX G70
• 2025+ BMW X3 M50 G45
• 2023+ BMW X5 LCI 40i/40iX/50eX G05
• 2023+ BMW X6 LCI 40iX G06
• 2023+ BMW X7 LCI 40iX G07
• 2023+ BMW XM 50e G09