So I have a 2008 TL-S w/ a XLR8 Cat-back exhaust. Im going to eventually add on a cold air intake and a XLR8 J-pipe. Could someone give me an estimate of how much HP Ill gain from all this... Thanks.

 

anywhere from 5-15 hp.

 

Thats it? The Injen CAI said I'd gain atleast 12 just by itself.

 

CAI companies lie like crazy.

 

weak.

 

Pretty much. You're doing good though. A CAI paired with exhaust mods will help. More air in and more air out.

 

you must be new to modding, companies will always say "you can gain up to X HP." What they don't tell you is that it took them 10 dynos and it was in perfecT conditions with a car that had a highly restrictive stock intake.

 

Go for the J Pipe you won't regret it.

 

I kinda not trusting in catback exhaust and CAI, they only make noises and increase in no term of performance but that IMO, well unless they retune the car and put on they dyno again then may be there are gain in HP.

 

Definitely am haha

I think Im leaning towards one. and the CAI.