hi guys i was thinking about getting a bromz high flow cat off ebay, but my ? that it have a 2.5 outlet opening will i be able to use my stock exhaust tubing and also can i put it on my self

 

If you know how to weld.. I think that the exhaust tubing is going to be to small. but youll have to check that out

 

i know i should not have done this but i just cut off my stock muffler and added a performance muffler i really did not want o get a cat-back but is it ok to cut add a high-flow cat on in the future i might get bigger pipeing but will it be ok to just add the high flow cat wil it make my muffler louder