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Old 03-04-2013, 10:13 AM   #66
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You could put a full simple steel pipe from front to back as long as you pass your emissions test when called upon which for older cars is every other year and I think every 5 years for newer ones.
I ran a straight pipe in my very modded Eclipse and when it came time for emissions I just bolted the stock cat back in and lowered the boost back to stock levels and ran the car hard right before the test and it passed everytime.

3" from the turbo back and ugly as hell but sounded nice and threatening especially when flames shot out the pipe and no tricks needed it just that rich.
'12 Focus Red Candy SE Sport 5 spd
'99 Toyota 4Runner Sport
'11 Subaru WRX STI Hatch
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