This dyno was done last summer 94F with stock headers and 93-109 mix.....notice how timing is being pulled back at 7600rpm's! with water/meth sprayed 6" post intercooler this timing pull back won't happen. So imagine where the numbers would be and that isn't including the higher oxygen for cool air. Throw on another 20+ for the headers and I think we are getting close to 480whp in the heat of the worst summer
Big winter horse power with sticky summer drag radials
this will be very noticeable!