Good point. My AF/S Shelby Z with the intercooled 2.2L seemed best at 20 PSI which is only 6 PSI over stock. I also went thru 3 sets of pistons and 3 new heads on my learning curve. But enough fuel with 20 PSI & C-16 kept it all together for 13.26 record. I wonder what would have happened with an aftermarket cam and headers?