well ok sofar the motor i am buying has the biggest cam comp cam offers, bored .030 over, p&p, ducked heads to up the compression a bit, and upgraded valve springs n push rods, claims to be making 250-275hp i call bs n say maby 225 if hes lucky and thats with stock tune and stock externals such as maf, injectors, and such so thats why i figure if i add the m90 kit that i am also buying from him that i could achieve the 300hp mark with 5-7 psi like i know the motor is awsome as is but ive wanted to have that m90 sc on that 4.0 forever so i got a motor i can put on a stand and add and do work to it to be able to add the m90 but thing is i want it to run right but have no idea about these forced inductions and what they need