I just purchased a ITR header with a 2.5'' collector and a full 2.5'' cat-back for my ride.
I sure that the oem catalytic convertor wont fit because it will be too small.
What do i need to buy??
A test pipe and what size should it be?

 

Your best bet is to go get a tape measure and see.

 

what catback will you be using?

 

greedy but that is not the problem.
the problem is the other end of the oem cat.
is probably 2'' or 2.25.
i need 2.5'' in order to fit my Jdm ITR header with 2.5'' collector.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ruben19 &raquo;</TD></TR><TR><TD CLASS="quote">greedy but that is not the problem.
the problem is the other end of the oem cat.
is probably 2'' or 2.25.
i need 2.5'' in order to fit my Jdm ITR header with 2.5'' collector.</TD></TR></TABLE>

You'll need an aftermarket cat or test pipe with the appropriately sized flanges on both ends.

 

You can buy aftermarket jdm test pipe. That would be the best thing that you can do.

 

where can i find one for cheap.
i saw one on ebay with gasket and donut for $95 shipped