It's nice to see more and more options becoming available for this platform.
It looks like this downpipe starts out at a >3 inch diameter and then necks down to 3 inches for the rest of the length? If so, what's the diameter of the initial turbo connection section?
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2011 335d 11.68 @ 125.71 mph 1/4 mile NHRA certified track
Ram Cummins with lots-o-mods
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