Could anyone tell me if there is noticible difference in H.P gain with the holly airfoil? I am thinking about purchasing one and wold like togt som feedbac before imake the purchase.

 

I don't have a holley air foil i have another brand. I didn't feel any gain from it. www.WS6.com i think made 3 rwhp with a airfoil if i remember. It does something but not enough. If you can get one real cheap like $20 bucks i would say go for it.

 

I saw an advertisement for Holley in a recent issue of GMHTP. The ad quoted an article from a previous issue of GMHTP, stating that they dyno'd the Holley TB airfoil at 5.8 to the wheels. If that's true, I'd say it's worth 50 bucks.

 

I saw very little. Just a bit better throtle response.