Originally posted by MrFatbooty
So when you stick an intake, header and exhaust on a GSR it suddenly loses a ton of mileage? That's not what happens. Taking 600 lbs out of the car will have much more of an effect than adding 10 hp.
i was thinking more along the lines of larger porting and higher redline.
and yeah, if you lose 2-5mpg doing an IHE is likely. also, the celica GTS is proly at the noise limits for exhaust an intake as is, as well as emissions for that matter.