So i'm saving for efi live soon, and i want to tune the truck to its max potential, going to try and make some tunes myself. But my question is, is it bad to rev an a duramax, lb7 more specifically, up to 4k or even close to 5k rpm to gain more horse power with less torque? i want to save my stock bottom end and iv read that torque is the ultimate killer. So theoretically i want to raise the peak rpm between 4k and 5k for more horse power and less torque. I'm still learning and i want to know if their are any major disadvantages of high rpms and why i shouldn't do it?