ok now im lookin at the converters and i have a few questions

i just need the 2.5" inlet and outlet right??

and what ones will be the loudest since they are all about the same price??

i was also lookin at the performance curve website and for the y-pipes they only list a 2.5 in and dual 25 out, 3in 2.5 out, and 3in 3 out

what one should i look at gettin??

 

Yes 2.5". The Magnaflow 94106 will be louder than the 94006, and 94306 cats. 106 has a 9" body, and its as hollow and free flowing as it gets. 006 is a 12" with the same catalyst setup, 306 is calmer toned. For a Y pipe you are going to want dual 2.5" to single 3". Or wait, are you changing your intermediate pipe? If not, I wouldn't even bother changing out the Y unless your planning to run 3" exhaust for better performance.