Originally Posted by anoobis370z

Jack @ HP Logic is one of the best tuners in South Florida. He did my FI exhaust install and have seen a lot of his work. Honestly I'm surprised he netted you any gain without any supporting mods. As others have stated in this thread Nissan and other manufacturers have gotten really good at squeezing out performance from all the stock parts.

Also, I believe raising the red line is reasonably safe as long as you're not tracking your car.