Reworked the exhaust from the cats back. I got rid of the factory H-pipe and ran 3" from the cats to the X-pipe. From there I ran 2.5" allthe way to the mufflers. I used two MagnaFlow 1 in 2 out stainless mufflers. This website won't allow my dyno image to upload.
This page contains details on a 2006 BMW M5 .
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