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3/8" for mine. For the MightMouse, I used 'formed' 3/8 lines from the factory 'vent' tube, and 3/8 Fuel Injector hose for the 'clean side' catch can. The fuel injection hose have a 'teflon' lined tube inside of the hose.
1/2 would be fine if you can get the fittings -- will 'breath' better, but 3/8 will do if you run the boost level of 6-9 PSI...
-Don
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