1999 Acura Integra LS 2door

Hey im going to be purchasing a || DC JDM polished SS 4-1 (2.5") race header || and the || JDM ITR B-pipe|| with EZ tuning universal muffler (2.5") but i can't find the a 2.5" catalytic converter, has anyone ever ran this setup or something close to this? i need some help finding a CAT that will bolt on or welded on if i have to. Can some one please give me some advice. Im going to be buying this soon. Or if some one can tell me what setup i should use, cause i used to have a greddy evo2 full cat back but i did not like the size of the muffler and how dam loud it is being where i live here in cali. i got pulled over multiple times a week so i sold it with the cat on craigslist for 180 bux thats how much i hated it Straight COP magnet. I jus want something to flow better with a quieter sound.

 

magnaflow makes cat 2.5 try looking into that

 

^^^Yep I bought one when my oem cat went bad. Flows nicely, possibly a little to good because shortly after I replaced it and cleared the CEL code for the previous cat being bad I got the same code about a week later. But that code has been gone ever since I converted to obd1. I think I paid under $200 for it if im not mistaken. Some seller listed under google's shopping results. Go figure.

 

does that cat need to be welded? or was a direct bolt on? what kind of headers and exhaust tubing aka b-pipe are u using?