I know that dark blue coupe is the one that the Fast Fieros guy did a while ago and thought he used a LS4 for that not sure. Also one Ls1tech.com guys are using aftermarket heads cams and intakes for the LS4 so I dont get the whole LS4 vs. LS1 yes I understand their different and the LS1 is far more popular. But all things considered wouldnt it be easier to use a LS4 short block and not have to worry about the oil pan and clearance issuse then use the aftermarket heads intake and cams like the LS4 guys have already dont on ls1tech.com My personally Id love to have a Lacross Super with a TEP trans and cartuning turbo kit. Realistic maybe not, cost effective over a modded 3800 doubt it, Just becasue its different and Ive never seen one done is why I like the idea. I have seen turbo GXPs and a Turbo monte SS tho. Both make damn near 500 whp.