Im using the 90mm Lightning MAF and i know it's 4" but what do i need to reduce it to at the throttle body??? it's a 70mm and i think it's 3.5" i just want to be sure before i order.
70mm is about 2.7 inches. I think a 3" coupler should fit just about perfect. I don't think you would run into a problem with 3.5" either though. I just ordered some 3.5" couplers for my 70mm edelbrock throttle body today.