Cat Install question

[antirice454]

I just ordered the catco 6007 cat, and an o2 sim. I know that the y pipe is 3", I also know that I will need a reducer cone. I just need to know what size to get, basically, the size of the pipe after the cat. Where can I get one of these reducer cones at?

[hockeyman]

When I installed my Carsound Cat, I used a 3" to a 2 1/2" reducer. Then later on, I installed a 3" I-Pipe and trashed the reducer because I didn't need it anymore. I bought it at PepBoys for about $5.
Only thing was I had to shave about 1/2" off of the old reducer to make it fit properly.