Ok so my car is a civic si b16a2. so i am getting a type r header (2.5 inlet/outlet) and a new high flow catalytic converter. the new cat converter im getting was said to be 2.5 intlet but endings are 2.25 (outlet). basically its the same fitment as a stock cat converter. it is also said on the description that this new cat replaces the stock cat with no mods, just direct fit. i was looking on inlinefour.com for some jdm components and dont know which size to get. the 2.5 inlet/2.25 outlet or the 2.5 inlet/2.5 outlet. also which comes with the donut gasket. thanks. please help just with the sizing information. here is the site


http://inlinefour.com/25incolflan.html

here is the site for the cat converter

http://www.sparktecmotorsports.com/cat101c.html