I just added a Borla 3inch adjustabel cat-back to my 2001 Firebird and it sounds great. Before it I had a Flowmaster, but I wanted somthing different so I went with Borla. Its just as loud as my 40 series flowmaster was, but a lil deeper. Makes my car sound similar to a Trans Am. Now I want to get a performance catalytic converter and y-pipe. Which brand of catalytic coverter shoudl I go with as well as the y-pipe. Also by adding these around how much gains will i get from them and how will it changethe sound of my exhaust. Also please sugjest any other mods I should do. So far I've got a Borla 3 in. adjustabel cat-back, Whiper air lid, K&N filter, and BMR STB. Thanx guys!

 

catco and magnaflow are some of the cheapest i've found.....