Does anyone know about the intake air foils and if they work or not. The TPI intake air foil claims it adds 11.6 or more HP and 13 ft/lbs. of torque. this just seems like alot for $30.00

You for sure won't get any 11+ ponies from it. MAYBE a couple of extra horses at higher RPM.

I agree with Danase, If every bolt on gave you the power increase they promise you could get 600hp without turning a bolt. But I did put one on mine. I didn't really notice a power increase but my MPG went up a little on the highway. The throttle body opening is very poorly designed and should have had this in right away. I bought the aluminum one that mounts with a screw.