well im finally getting the 3inch downpipe the guy that does my exhaust asked me if i wanted to run 3inch all the way to the exhaust this means i would have to get a bigger cat. umm not sure what to do give me some ideas? is is worth the money or just a waste!

 

What do you drive will be the first question.

 

What you drive and how many other supporting mods are the big question. If you have a supercharged engine with say a slightly downsized pulley.... maybe a cam, I'd say go for it. If you're Naturally aspirated 3.4 or 3.8, I'd think about 2.5" all the way back would be good. How much is all of this going to cost you?