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  1. E39 (1997 - 2003)
    I've looked this up on multiple forums and haven't been able to get ONE consistent answer to this question which I thought would've been fairly easy to find. I'm looking to make a custom exhaust for my 97 540 and I want to install an X pipe right after the O2 sensors but I want it to clamp on so...
  2. 7 Series - E65 / E66 (2002 - 2008)
    I'm thinking about either installing an x pipe in place of the resonators, or QTP cutouts. Does anyone know the exhaust piping size on the E65 745i? If you look at this image, I'm specifically referring to the two pipes running between the two sets of resonators.
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