BMW S58 Downpipe Flange Gasket 70 mm

An exhaust without leaks starts with a proper seal. This 70 mm stainless steel flange gasket replaces the gasket on the downpipe flange of the S58 inline-six. You use it when fitting new downpipes, when swapping exhaust parts and when servicing the system already on the car. The BMW OE reference is 18308053348.

Performance and construction

• Stainless steel, able to take high exhaust temperatures and repeated heat cycles
• 70 mm diameter, sized precisely for the downpipe flange on the S58 platform
• Keeps the joint sealed, so no exhaust gas escapes past the flange
• Fits both the Valvetronic downpipes and the factory parts

Fitment

This gasket fits the BMW G80 M3, the G82 and G83 M4, the G87 M2 and the F97 X3M and F98 X4M, all with the S58 inline-six. Whenever you take an exhaust part off, fit a new gasket instead of putting the old one back. That is the difference between a joint that stays sealed for years and one that starts blowing after a few thousand kilometres.

What's included

• One or two 70 mm flange gaskets, depending on the set you choose

Installation

The gasket drops onto the flange the way the factory one does, so nothing needs adjusting. If you are not sure how many you need for your build, send us a message at info@valvetronic-europe.com.

Specifications