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downpipe to catback

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slow gst

slow gst

10+ Year Contributor
218
2
Apr 16, 2009
Hightstown, New Jersey
Would the 3" punishment racing downpipe bolt up to a thermal exhuast. I just got the catback today and where it would bolt up to the cat it necks down to a 2.5". So I'm not sure which downpipe to buy or what people have done about this..
 
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