2" phenolic on my ld340 to get it in the hood opening. 6 pk type. I have no track time yet but the motor is very angry and no lack of power anywhere in the rpm range. Reminds me of my gsxr 750. Lightning revs.
i hit the ''none'' button.
I`m sure I need a spacer to increase plenum size, but my 1200 cfm throttle body is up in the 6 pack hood already/setting on a victor intake/with raised port heads.
