ClaireRZ-S Posted December 5, 2008 Share Posted December 5, 2008 hi folks just wondering will the 1st decat (2.5") connect into the 2nd decat which is 3" of do they have to be the same size to connect properly. thanks Link to comment Share on other sites More sharing options...
Chris and Alana Posted December 5, 2008 Share Posted December 5, 2008 I believe the do, the same way as a 2.5" inch second decat will fit to a 3" cat back exhaust. The flanges should be the same size which will allow tyem to bolt together but the diameter of the pipe will be larger on the second decat. (which doesnt matter) Link to comment Share on other sites More sharing options...
Rinus Posted December 6, 2008 Share Posted December 6, 2008 I think it will fit, j-spec first stock cat--> 3inch 2nd decat fits... (i'm not sure 2nd decat is 3inch, can be 2.5" though) but first cat is smaller diameter, than 2nd decat... Link to comment Share on other sites More sharing options...
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