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I am not quite sure what you are trying to say, but your stock exhaust is not 1/8" wall thickness unless bmw is preparing for the apocalypse.
FWIW- My old civic made around 215whp through a stock oem midpipe (no muffler) which necks down to 2". It made 160whp with stock oem muffler in place at the same boost. 55whp gain just by removing stock muffler.
Your stock exhaust is 2 3/8" od as you said which leaves the ID at 2 1/4" if it is not a double walled tube. So in theory your stock piping should support at least 430whp. Which makes sense as turbo s2000s with stock exhaust have made 400-420whp. Efficient-->No
Possible-->Yes
are there any other mods to it?
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