So far my mods are:

CAI
Header (4-2-1)
Highflow Cat
2.5" pipe to muffler (straight through kind)
10mm wires
Ground system

What its doing now is idling very weird and hesitating under heavy acceleration, its ok for like 6 seconds and then like chokes and gets really rough for a bit when it idles. I just got my exhaust done from the cat back. The whole day after gettin the exhaust done it seemed fine, then the car sat for about 4days after which I put on my 10mm wires which it sat for another 2 days. Today i decided to take it for a spin with the new wires on. At first it seemed ok until i got it warmed up. It kept wanting to die. Another thing is that going at half throtle i got great power but when i floored it, it just slowed and seemed like it was either gettin too much gas or something like that. it also sounded like it was backfiring constantly inside the muffler (like rumbling weird).