RevOD,,,
Using an intercooler would help get intake temps down, thus reducing the chance of detonation, even @ 5 psi of boost pressure.
An intercooler will allow you to make more power even @ 5 psi.
What heat range spark plugs are you using?
Remember,,,, you cannot hear all detonation,meaning ,, your engine could be detonating & not hear it.
If you want to save money & not use high octane fuel(93),you could run 87 octane w/methanol injection.
Otherwise,, you could go up to 14 psi boost,(or there abouts) pressure w/methanol injection & 93 octane fuel.
You have the boost timing master MSD?
MBHD
