I'm putting on a pair of Magnaflow cats to replace my worn stockers. I have one that came with my Magnaflow catback for free, which has 3" openings. If I order another 3" cat, will they install without too much trouble? My exhaust is stock except for the cat-back, which is also 3". Thanks!

 

Bump. Basically all I need to know is if an exhaust shop can make a pair of 3" cats work with the stock exhaust manifolds/Y-pipe and my catback...

 

Ill sell ya a y-pipe that has 2 high flow cats for $125. I payed will over $500 for it.