I wanted to upgrade the Exhaust on my z4 3.5i because of two reasons:
1 As Preparation for a performance upgrade.
2 Some more sound without it being obnoxious.
So what did we do.
Take out the center section of the Exhaust and inserted a Fox X-pipe. This way you get a true X-pipe and get ride of the restriction in the piping to the right backbox. And while we had the Exhaust of the car we installed some stainless/Carbon endpipes.
1 As Preparation for a performance upgrade.
2 Some more sound without it being obnoxious.
So what did we do.
Take out the center section of the Exhaust and inserted a Fox X-pipe. This way you get a true X-pipe and get ride of the restriction in the piping to the right backbox. And while we had the Exhaust of the car we installed some stainless/Carbon endpipes.