so here is my current mods:
Injen CAI
MD 5/16" Spacer
Crawford HFC
Topspeed Headers
x02 TD Exhaust ( use to have Invidia G200)

When i use to have the Invidia G200 and after installed the Headers, at around 4K rpm i can really feel the gain from the headers, 2 weeks later i switch my exhaust to x02, and now i cant feel the gain like i use to with the Invidia G200, maybe i got use to it? when i still have my Invidia G200 i didnt really got on it much, like 2times ever since, then switch to x02, so it is just me or the x02 make me lose power? and i also change wheels, from tires 265/35/18 all around to 245/40/18rear and 235/40/18front, dont know if they will do anything to performance but... And now that my Check Engine light is on, i try to unplug the battery then it turn off for couple days and now it turn on again. Any idea whats wrong? Will a tune fix all these problem? Im planning to get my car tune in the next couples day.

 

What happened to the Invidia G200? Can you put it back on the car?

 

DAMN!! i knew i was suppose to do that b4 i sell the Invidia G200, but i was lazy!!! so is there any other way to find out whats wrong with my car?

 

Sorry to hear that bro. My X02 did me good. I mean there's only so much you can "feel" from an exhaust. You will definitely benefit from a tune. I don't know why you feel a loss of power, maybe you did lose hp, . I used to have a cold air intake and I definitely felt a power loss with that garbage. With the Non rev-up, I'd say stay short ram. When did you have the Injen CAI installed? Before or after X02?

 

My mods in order:
1st: Invidia G200 TD Exhaust - feel little gain in 2nd
2nd: Injen CAI - feel a little gain, but not really sure
3rd: MD 5/16" Spacer - seriously i dont really feel anything, or just me? maybe...
4th: Crawford HFC - feel the most gain out of all the above, feels my car flow alot better
5th: Topspeed Headers - feels the MOST gain after 4k rpm out all the above
Then swtich to x02 exhaust - feels like before i got the headers installed

 

Not enough Back pressure maybe.....

install an X pipe instead of the H pipe,

thats what i did now i gained a little more throttle response at take off.

but mine is for sale now because my BASSANI is on its way!!

 

Prob just got used to it , second get your code checked.