quick coupler question

[fork5o]

im gettin new couplers for my air intake. i got a 73mm maf and 70mm throttle. do i want 3" or 2.75"? thanks guys

[sutyak]

I'd try 2.75".
70mm = 2.76" = .01" difference vs 3" (.76")
73mm = 2.87" = .12" difference vs 4" (.13")

I think you'll be fighting an air gap with 3".