Hi, I never had any problems with the bottom end when the car was modified only the crappy lsd box so replaced with non lsd and the head gasket so that was uprated! Pushing 14 psi diff exhaust, air filter dump valve and modified turbo showed 244 bhp at the wheels on a dyno and was told that I would lose about 35bhp from the gearbox so roughly 280bhp. maybe it was wrong but it moved when asked!!
I must admit the sound of the turbo is very addictive
Just wish that marlin had still had there turbo demo car........