Im not really sure. My dream would be to pull up to a GXP and smoke him with his girlfriend in his car and make him feel stupid for paying more for the GXP package when he just got beat by a GTP, but I drive the LS4 alot at work and i know what they are capable of and I just dont know if getting over 303hp is possible. Well let me re-phrase, Im sure its possible I dont know if my wallet can afford to get over 303 LOL