Um... I have no problem testing the limits of stock internals...LOL. Alex you have been to the shop and seen the motor selection. De+t, DET, GTI-R they are all good for 400whp on stock internals..... I do recomend that whatever motor you choose that you replace the rod bearings right from the start.... Rod bearings are the weak link in the Sr motor... As been mentioned before, for your build needs goto Gspec performance.. Greg is an awsome guy and very helpfull... Also start thinking about what you are going to use for engine management.. without that you just have a shiney motor in a car that will not run.