I'm going to be modifying my Greddy collector soon with 2.25" piping. i also have a car-sound 2.25" cat and Greddy evo cat back on a JDM H22A. I'm a broke college student and don't have alot of money to play around with yet, so I'm just going for the most power that i can get with what i have right now. What design does everyone think would be more efficient? Do you think i would need engine tuning to make this work safely? thanks

 

my buddy has his greddy for sale w/ a 2.5" collector

save ya the trouble...

 

thanks for lookin out. but i really don't have money to spend on a whole new header, plus i already bought a $40 flex pipe and O2 bung from Kteller. All i need to do is take it to an exhaust shop.

why is he selling it? and how much does he want?.. i know someone else that may want it here in Socal. shoot me a PM.