I've never looked into the firing order of the sho, is it different than the F-150? It could explain the difference in the sound of the exhaust.
I've never known what to do about the exhaust since I like it quiet but then when I get on it here and there it's hard to keep track of gears/rpm's when I use the paddle shifters. I also like to use the the paddles in traffic to avoid constant shifting to save the tranny and torque converter. So when i have the music up, I have to keep looking at the tach to know when to shift lol; oh well.
Lets face it though, since the sho was introduced, it has always maintained sleeper status and that is what mine is. I think it's hard to be in-between in this car. Either low key mods or an all out BDP assault street sweeper.