He only wants to make 250rwkw, not 400, why advise him to spend a thousand dollars if it is not necessary?
Boost or comp , tune to suit, higher comp = lower peak boost, and vise versa, i run 9.5:1 and 30 psi to make over 400kw, i would have to run 35-40 to make that power with 8:1 comp. and you loose mid range with lower comp. it is a street car after all. There are plenty of people making good power on standard internals including head gaskets on this forum. ask around? a few examples are Adrian Hodgson (2RISMO) making 265rwkw with 100 gas, Daniel Beer Making 285rwkw, Rob Brown Making 290rwkw, all street cars, all standard internalled, Jason is seeing well over 300rwkw and has run a 10sec pass in his car.