Who here is boosting 15psi aund up? I'm boosting 10psi and I wanted to know if anyone really notice a difference. And I mean a real differece not a little more pull. I have everything to boost 15psi and may be a liitle more. But pushin' it. Just need to install and set. The main thing is injectors to install I have some 310cc and 450cc. I going to install 310cc and I'm selling the 450cc. I've blown #2,4 pistons from detonation. So I Know the importance of fuel mixature and ignition retard. Well just wanted to know if there is a real difference.