K so i got a 2003 4 door..i got an exhaust, K&N filter, and an isothermal plenum spacer but i was wondering what else is there out there that i should do? I dont have the money to supercharge or go turbo yet so if any of you can help point me in the right direction or give me somee ideas id appreciate it.
And also i would like to know if anyone knows the why the 05-07's got more power than the 03-04's...what is the difference between these years? what do they have from factory that i dont?

 

High Flow Cats or Test pipes for a better flow with that exhaust you have.
05-07 could just be better tuned

 

mod that is best bang for the buck...hands down, sway bars

 

Geo Bau.
Secondly, I agree^

 

I suggest you search this, as it has been covered many times. But I won't leave you hanging without a starting point

Here are a few threads with answers that may help you (same question you asked):

https://g35driver.com/forums/showthr...highlight=bang
https://g35driver.com/forums/showthr...highlight=bang
https://g35driver.com/forums/showthr...ight=best+mods

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