HJS ECE Downpipe, BMW M3 / M4 G8x, X3/X4 M F97 (S58B30)

A high-performance HJS downpipes designed to replace the original, restrictive downpipes in the S58B30 engine while preserving road ECE certification.

This free-flowing performance downpipe typically lowers exhaust gas temperatures and reduces turbocharger stress due to decreased back pressure. These improvements enhance spool-up and overall performance, benefiting both stock and especially tuned engines.

• ECE Road approved
• 2x 200 cpsi tuning-grade stainless steel catalyst
• Pipe diameter: 76 / 70 mm
• Plug & Play, fits like a stock part
• Performance-optimized
• Reduces turbocharger temperature and exhaust back pressure
• Sportier sound