Originally Posted by gabrieldy
It's all in how good the tune is and making sure you don't get bad gas. You need a good rich tune of 11.5:1 a/f ratio, 93 octane and a boost friendly timing setting of about 17 degrees (+/-).
Ford (via Roush) is running 5-6 psi on the 2011 mustangs and that c/r is 11:1. They still offer a the full factory 3yr/36k mileage warranty too.
You could have forged everything in your motor but if you encounter detonation you're toast.
Here's a quote I read posted on my tuner's wall. "There are 100 tooners for ever 1 tuner."