well last weekend me and my friend decided to go out and do a couple pulls, i wanted to see the difference in modifcation and how much power they gave my friends 04 sti. here the mods
04 sti: headers,kn intake, and a turbo back
05 sti: hks cat back
we did a couple runs, the first was a second gear pull and did three honks and went. i jumped a littel but in front for like a second buy the time we shifted to third he passed me and kept going, pulling hard to about he had car by 4
then a roll from first, that time i got walked on i shut down by third cause there was no hope, it wasnt even close.
i was amazed those mods made a nice difference i have my kn intake in my car buy tusday so we will go again and see if that makes a diff, and as a mod we are goign to keep testing to see what the best mix of mods but if you looking for a quick sti compared to a stock headers kn intake and a turbo back, its awsome