Hey i have a 70mm BBK thottle body....so i was looking at purchacing a BBK intake plenum but i saw that they have a package with a 75mm thottle body and the plenum......would it make a big difference in performance between a 70mm or a 75mm thottle body?

 

Its going to be very minimal. Dont worry about it, you already have a 70mm so there is no reason to buy the 75mm now.

 

how bout this il buy your 70mm