We were asked to put together a Rush Exhaust F6B Video with sound.
We did our best, so here it is.
https://www.youtube.com/watch?v=fIcZxJ_-K9Y&index=1&list=UUChFX59NYH5wRDs1KHK2kgg

The Baffles are 2.25", using 2.0" will give you about 3-4 decibels less sound. Going up to 2.5" will give you about 3-4 decibels more.
Rick