Milltek Sport BMW G80, G81 M3 & G82, G83 M4 OPF-Delete Exhaust Non Resonated X-Pipe Midpipe

Enhance the soundtrack and performance of your BMW G8X M3 or M4 with the Milltek Sport Non-Resonated OPF/GPF Delete X-Pipe Midpipe. Constructed from high-grade T304 stainless steel, this single 102mm mandrel-bent midpipe replaces the restrictive OPF/GPF section with a free-flowing x-pipe design—delivering a sharper, louder exhaust tone and reducing backpressure for improved throttle response.

This system is designed for drivers seeking a more aggressive, motorsport-inspired sound and is ideal when combined with a Stage 2 ECU remap or OPF/GPF delete module. It’s available in two configurations:

• SSXBM1336 – Fits directly to the OEM rear exhaust system
• SSXBM1338 – Designed to pair with Milltek’s axle-back system

Please note: This non-resonated version offers a rawer, louder tone for those looking to maximise sound output.

Why X-Pipe?

Although the Milltek OPF-delete X-pipe midpipe for the S58-powered G8X M3/M4 sits within a single exhaust path, the X-shaped geometry still plays a critical role in refining tone and reducing unwanted resonance. Instead of balancing between engine banks, this X-pipe helps smooth turbulent flow created by the turbochargers and previous bends in the system. The result is a sharper, higher-pitched exhaust note with reduced rasp—ideal for the S58’s naturally aggressive tone. This makes it a perfect choice for drivers looking to enhance volume and clarity without introducing excessive drone or harshness.

Key Features:

• Deletes OPF/GPF for enhanced sound and reduced restriction
• Large 102mm (4”) mandrel-bent stainless steel construction
• Non-resonated x-pipe layout for an aggressive tone
• Designed for use with Stage 2 remap or OPF/GPF bypass module
• Precision-engineered fitment for G80/G81 M3 & G82/G83 M4 models

Compatibility:

BMW G8X Series (OPF/GPF-equipped models only):

• BMW G80 M3 Saloon (2021+)
• BMW G81 M3 Touring (2023+)
• BMW G82 M4 Coupé (2021+)
• BMW G83 M4 Convertible (2021+)
• SSXBM1336: Fits OEM axle-back system
• SSXBM1338: Fits Milltek axle-back system

Note: Cutting may be required when fitting to the OEM system. Intended for off-road or track use only where legally permitted.