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Originally Posted by me612
don't thermal catbacks narrow down from 3" to like 2.5 or sumthin so they can mate up with stock cats?
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My 1G FWD system narrowed down to about 2" to fit the stock cat but I just cut it off and ran a 2.5" piping. When I ordered mine through HRC they offered to set it up for 3" slip fit at no extra charge.