Did a search but every topic is pretty old with out much info.

Has anybody heard if there are in performance enhancers out there for our V8's?

I would really like a dual exhaust more for looks and sound too.

 

I recall reading that some had slapped a TRD supercharger on the 4.7L V8 motor and it packs a good wallop. But I also recall reading that you can't get that from Toyota any more. Don't know what the current status is.

Otherwise, I'd say the standard bolt ons like a CAI, catback exhaust, chip? Sorry, not much help because I haven't personally looked to do these mods for mine.

 

CAI? what does that stand for?

I read about the exhaust but i have the system that lets the rear of the truck move up and down. Will a dual exhaust system still work? I would like it to run behind the rear wheels.

 

CAI=Cold Air Intake

Though I don't have a GX please feel welcome to take a look at my page below to get some ideas of off my RX300.

I have y-pipe after my resonator and the difference is quite noticeable after I had it put in, much less hesitation and more power.

Given that Iowa, like my home state of Florida, doesn't have emissions testing, you shouldn't worry either, though doing anything post-cat woudn't affect the emissions anyway.