On 91 I just don't see how its possible. My limit on 91 octane seemed to be about ~ 350rwhp (and I did 371rwhp on race gas, just for fun-sies). To get 375+ rwhp on 91... I just don't know where I'd pull those extra 25 horses from (except out my ass?). Aside from water injection (which is cheating in this context because WI moves the detonation threshold), or driving to Denver and dynoing there (hehe :-P ), I don't know what else I could do. *shrug*
Inzane (formerly Z-Jay) Vice President - Edmonton Z Car Club 93 300ZX TT - Stage VI