I think for Autox neither will hook up. If building for Track Day warrior, leave boost alone for reliabilities sake. Running balls out for 20+ laps is a battle against heat already so don't compound the problem with boost IMO. I have tuned my car pretty conservatively from idle to 4000 rpm and it is still to much for 335's in an Autox scenario. Add a supercharger and I could drift the entire 1 mile course easily. Put 275's on the rear of my car now and I could probably do it already.