The HM S68 Midpipe is precision engineered for the 2025+ BMW G90 M5, designed to enhance both sound and performance while maintaining OEM fitment and quality. Constructed from high-grade 304 stainless steel, this system replaces the restrictive factory midsection with a 76 mm (3.0 in) mandrel-bent design that improves exhaust flow, reduces backpressure, and delivers a deeper, sharper tone from the S68 hybrid twin-turbo V8.
A custom-formed heat shield is integrated around the front section where the midpipe connects to the downpipes. This helps protect nearby components and reduce tunnel temperatures, especially during high-performance driving or extended operation in warmer conditions.
Each HM S68 Midpipe is a direct bolt-on replacement using factory-style flanges and hangers, and it includes all necessary hardware for an easy, no-weld installation.
Key Features
• 304 stainless steel construction for strength and corrosion resistance
• 76 mm mandrel-bent piping for optimal flow and performance
• Designed to enhance exhaust tone and reduce restriction
• Integrated heat shield near downpipe junction for improved thermal control
• Bolt-on installation with supplied hardware—no cutting or welding required
• Compatible with OEM and most aftermarket rear sections
• Engineered specifically for the G90 M5 S68 hybrid V8 platform
Performance and Benefits
• Deeper, more refined exhaust tone with an aggressive character under load
• Improved exhaust scavenging and reduced turbo backpressure
• Lower tunnel temperatures for greater component protection
Production and Shipping
This product is currently made to order with an estimated lead time of approximately 3 weeks. All HM exhaust products ship directly from Orange County, California, with typical delivery within 4–6 business days once shipped.
Not for sale or use on vehicles registered in the state of California.
Optional listing additions
• Sound clips (cold start, in-cabin, and exterior)
• Weight comparison versus OEM midpipe
• Suggested installation time (1–1.5 hours)
• Warranty information such as limited lifetime coverage on welds and materials
