The RVNG 4.5" Stainless Steel Single Midpipe is the largest, most aggressively engineered midpipe for the S58 platform. Where most companies stop at 3.5", RVNG's 4.5" design delivers a massive 65% increase in flow area — removing the restrictive OEM midpipe to minimize back-pressure for faster turbo spool, sharper throttle response, and a raw, aggressive tone. An extended brace is included.

Key benefits

• +20HP / +32wtq to the wheels
• 65% larger flow capacity than standard 3.5" midpipes
• Faster turbo spool and improved throttle response
• Deeper, more aggressive exhaust tone
• About 17 lb lighter than OEM
• Fully compatible with OEM and aftermarket downpipes
• MPE compatible

Build highlights

• Mandrel-bent, TIG-welded 4.5" 304 stainless steel
• CAD/CAM flange design for a smooth transition
• Optimized radius bends for maximum flow
• Direct bolt-on fit, LHD and RHD

Note: on lowered cars the larger pipe may scrape over speed bumps; minor scrapes won't harm the product. View the install guide.

Fitment

• 2020-2025 BMW G80 M3
• 2020-2025 BMW G82 M4
• 2020-2025 BMW G83 M4 Convertible

Backed by the RVNG RaceWorks lifetime warranty on fitment and craftsmanship.

Emissions disclaimer: This product is intended for off-road, race, or closed-course competition use only and is not legal for use on pollution-controlled vehicles operated on public roads in most states and provinces. You are responsible for compliance with all applicable emissions laws. Please check your local laws before purchase and installation.

Ships from our Vancouver shop — KORE SPEED is proudly Canadian-owned, with no surprise cross-border duties for Canadian buyers. Questions on fitment? Email support@korespeed.com.