I've ordered these 4 parts. JBA Shorty headers - Borla CatBack Stingers - Steeda Underdrive Pulleys - and a Cold Air intake and K&N filter. My 2004 GT is bone stock right now. So far the exhaust system had come in the mail. I'm going to have it all installed at once. Any ideas? I'll probabaly have to tune my car after right?

 

I'd get the intake and exhaust done at the same time. As a mechanic told me, get let more air out unless you let more air in. I'm not sure how much you are going to get (have the same car) but I'd guess 20-30hp? Let me know when you find out for sure. Do you have pictures to post??

 

15-20rwhp at most

 

Agreed. Let it breathe. Exhaust without HCI won't give you much of an improvement. Frankly, I doubt that you'll even notice the difference with these mods, but I'll be interested to hear about your results.

 

I did my intake and exhaust at the same time on my old car (97GT) and I really noticed the difference.

 

But isnt that partially because the old intake had problems?