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When you look at an extremely restrictive stock exhaust like this Nissan 240SX piece, note the narrow cross section in the crushed bends, the small pipe diameter, and the unnecessary amount of bending. THe A'PEX exhaust next to it has a large pipe diameter, wide-open mandrel bends, and is as straight as possible given the under-car space restrictions. This particular exhause made 15 hp, thanks to the poor design of the stock part.
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