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: is there a difference in HP output,are there any benifits of one over the other? I'm looking for my '90 n/a coupe so any responces will be much appreciated : thanks,JC right before the muffler on the PE the piping increases from 60mm to 70 mm. On the SP it's 60mm the whole way. also, the muffler itself is different between the two. the PE is a cylinder-shaped muffler with a thin-wall 4.5" tip. The SP is an oval-shapped with a rolled tip (starts at 4.5" and flares to 5"... megaphone style). Pics can be seen on the site (link below.. go to the exhaust section).
Later, Phuong
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