The 370Z's engine is strong in my opinion. In specialty z's blog there are plenty of 370s with 300whp that only have and exhaust intake and tune. While I prefer our twin turbo 3 liter more. The vq37hr will easily put out alot more than 250hp. I would take a 330hp v6 over a turbo 4 cylinder which will probably only put out 270hp at the most.