Yeah but the AFM is pre "post fat bit", as shown in the pic above, so it shouldn't make a difference? Pretty sure the WRX AFM is happy with 65mm as my APS CAI retains a 65mm diameter to prevent issues with the AFM.

Didn't know the STI stock intake diameter was 80mm?

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[SIGPIC][/SIGPIC]
Should have bought an STI