Ok So I Have a Series II 3.8 98 GTP. Ultimate goal is over 500 hp w/o NOS. Realizing how almost impossible this is going to be... (I dont want to turbo) SO, has anyone put the 5.3 into a 97-03 grand prix. If so what all would this entail? 2nd. Has anyone put an m90 on the 5.3? Assuming A custom Lower intake would have to be fabricated at the very least and some way to spin it. Anyways just bored and being curious! Thanks people!