From what I read this is a bolt on for the Fuel Injected ECU rigs because the ECU can richen the mixture if you jam more air down its throat. Carb rigs would require playing with the jets or mixture adjust.

ToyHooter
90 LWB Montero
Sliders, Dual Bouncies, K&N, Flowmaster, Rancho Stabalizer, KYB Gas Adjusts,
ARB Compressor Under Hood, ARB Locker Waiting Garage Floor, Spare Tire Bike/CB Ant Mount

"I didn't do it, you didn't see me, you can't prove it."
Bart Simpson