Isn't the American Racing Header/exhaust system (mostly) 3"? I thought it only went to 2.5" to fit with the stock exhaust, but was 3" everywhere else.
http://www.hennesseyperformancestore...ststlotuh.html
I find it strange that a 556hp motor would use a 2.5" exhaust. That's at the point where a 3" system seems like it should be used.
Did Ron say that his mufflers can handle this much HP without any issues?