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.

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

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