restrictivness your no bigger than your smallest diameter opening which even on the svt's is your throttle body which is 60mm and the fipk kit nothing is smaller than that so i see no prob. if you have multiply products with different diameters say like a 75mm mass air meter and than a 55mm throttle body this could cause probs caused by turbulance entering your intake which is not a good thing. but like i was saying you svt guys should not have a prob with a restrictive opening on the intake.
