[dsun87]

ok i've done all or at least most of my research...i think..

so far i found out my 420a can handle max 7psi of boost on stock internals
my stock fuel injectors can handle 8psi max

and to upgrd my fuel system all i need is a walbo 255 and a FMU 12:1 ratio
and dats all for my fuel upgrds

1 so far is this all right info?

2 do i have to test and tune my car?
i heard dat if i have a FMU it will raise the fuel pressure while am boosting
so is this true too?

thanks guy