I saw and exhaust system on exileracing for around $600 It was the headers, downpipe, cat, and muffler. I was wondering with a stock engine will I have to worry about alot of backpressure from me not giving it alot of throttle all the time. I know all exhaust systems have it but with 3' piping will it increase. I am alow gonna get a cold air intake with just seems like common sense.

 

i wouldn't get a 3" exhaust without some kind of forced induction.

 

so your sayin to get the cold ait intake first then the exhaust..

 

im saying forced induction is turbo charging or super charging.

 

I wouldn't suggest anything larger than 2.5" exhaust piping for our cars, unless you have a turbo or supercharger attached to the motor. Forced induced cars need to breathe, whereas N/A cars need a little backpressure and if you get a 3" exhaust and put that on your N/A motor, you will most likely hurt performance than help it.
I've got a 3" turboback, that's 3" piping from the exhaust side of the turbo to the muffler, it helps me, but it won't help you unless you are turbo'd also.
Stick with what you have and get a CatBack exhaust. If it's sound that you're looking for, bigger isn't better in an N/A motor's case.

 

I also wondering about that Cat cuz I travel alot this is like the 8th state I lived in and sum states allow certain modes while others don't. I know when I lived in Maine (ME) yor not allowed rims over 2 sizes bigger that stock so Dub 3's (23' rims) are unheard of and your not allowed to mess with anything before the CAT. I just want more low end power. I don't race with her cuz I still don't know her limits but In TX theres is alot of stop and go and switching lanes. I would like to be able to be at a dead stop mash on the gas and be able to switch to the next lane with out double clutching 1st ( reving up the engine then shifting into 1st) all the time because (cuz) i end up spinning the tire (yes Tire cuz no posi) and waisting valuable (that word doesn't look right) seconds doing so. Plan is to get 18' deep dish rims with sum basic 5 star rims cold Air Intake and 2' 1/2' exhaust I really don't want 3' and want to stay way from upgrading the fuel untill gas prices drop a lil (little) more.