How Much horsepower will a 7mgte will hold with stock pistons and stock rods? How much boost can it hold in the same condition? What turbo can be better to a steup for a supra that is going to run at 15 - 20 psi with a 3inch exauhst? Wich head Gasket is better a Greddy or a HKS? Is there any setup that can be better than 2 walbro with 650cc injectors? Does anyone know how much is worth a HKS Piston?