hi there i have one of spc turbo kits and all i can say is that its the nuts.
you get so much for your money,if you compare it to the supercharger kit the power diffrance is out of this world.
i think the supercharge ones could just get 220bhp,stage1 turbo kit is 250bhp,and then all you need to do is get the stage2 kit which is bigger injectors and a remap and you are over 300bhp,and this is still on the std engine.
im waiting for my bigger injectors so at the min im on 250bhp but boy dose it make a diffrance the car just comes alive.
mine comes on boost at about 4000k which is nice as you can drive around town and it is still a lexus but then let it rev over 4000k and all hell brakes loose.i get the noise from the screamer pipe and the chatter from the turbo then the dump valve.
as i say the car has come alive by doing this i highly recommend it.
thanks jamie