Based on your feedback I think I'll start small and gradually enlarge the hole until I like what I here. Just a hint of throttle would be just fine for me.
I'll try to refine the heat blocking foam. If I come up with something I think might be better, I'll post details.
2012 SEL 5 door w/Premium Package - April 2011 | 1957 Chevrolet 3200 - 2005
2000 F150 Sport 2000-2011 | 1988 Ranger XLT 4wd 1988 - 2000 | 1966 Mustang 1983 - 2008 | 1963 Ford Econoline Van 1979 - 1983