My car is an NA, I have the " Ultra Gauge", intake air temp. used to be about 125 F, I increased the intake air tube size to 2.75inches on both sides and bring the air in before the radiator. This dropped it to about 115F. I have since insulated the bottom side of my air box( engine cover). I have not had a chance to even start it yet ( bad weather), I will follow up with update.