not really, the GT was designed well from the factory, so just replacing the Intake
and exhaust won't do much from the get go
GTS has a whacked-out rear section on the exhaust; a big muffler that enters from the side of the canister and a chunky little resonator before the tip, so replacing the rear section does a lot, and the Intake
is just not enough considering how much the 2ZZ can breathe from the factory. So, replacing these on the 2ZZ frees up a lot, even Short Ram Intakes
give good gains, since the factory setup is so restrictive.
The GT's 1ZZ can get a pretty good breath through the factory Intake
, and the gt exhaust is a lot less restrictive from the get-go. therefore the gains are lower...
definitely go with a CAI
on the GT, you'll get better gains from the reduced Intake
temps, go with the TRD
exhaust for best gains.
A pulley may help a little, but just like on the 2ZZ, don't expect much (unless you go with the crank pulley, it should be great on a GT, assuming it's dampened.)
Header gains may or may not be noticable on the GT. Is the GT exhaust manifold a cast unit or a welded tubular one like on the GTS? If the GT manifold is cast, and not tubular, then you may see some power gains ans some weight reduction.