I am looking at getting a throttle body airfoil for my car. Which one of the two would be best to go with between the TPIS and the Holley. I know this want add much power, but every little bit helps.

 

Get which ever one is polished. Smoother so air flows just a little better. I dont think the TPIS is. Also get 1 off ebay they'll be cheaper.

 

i remember reading the holley has to be ground to fit because it partially covered up the tb blades just a little. If i was you i would go with whichever one is cheaper. On a side note i have one for sale for 25 bucks shipped. I don't know the brand i have a pic though.