I just got installed my DC sport headers 4-2-1 1 piece with a Greddy Catback Exhaust Evo 2. OMG I LOVE IT, its so nice i can really tell a difference in power and in sound it just awsome i recommend anybody getting it little pricy but its well worth it. I got a quick quest though do i need to change my cat conver? if i do what should i get? Thanks guys later!!!

 

You don't NEED to, but it'll help if you get a hi-flow one.
Oh and nice choice of products!!!

 

How strict are the cops in FL and do you have to do emissions testing...
If the cops don't really crack down on modifications like I know they do in CA and some other unfortunate states, and you don't have to undergo routine emissions tests, I recommend putting in a testpipe/resonator. I know its not eco-friendly, but neither is a Hummer and thats a whole 'nother post. Megan Racing makes a nice stainless steel testpipe to match the EvoII. If you wanna see what it looks like, PM me and I'll drop some pics on ya.

 

You can either do a test pipe/resonator, high-flow cat, hollow out the normal cat, or just leave it the way it is. I think most people here would say do the high flow cat or testpipe/resonator. Keep in mind changing the cat won't affect the performance/sound of the car nearly as much as either the header of cat-back did, but it might add a few hp (2-3).

 

ive heard that the cat can hold back up to 10% of your engines power

 

Sorry I haven't had a chance to reply, Silentcracker. Been a little busy... I'll post some pics of the testpipe later...I took em last night.