For those seeking exhaust tuning, this HPA interview with BIY is worth a listen. For those unaware, these two ford engineers converted a Ford truck DOHC 2-valve V10 into 6.8L 8000rpm V10 40 Valve in their garage. It's a wild feat of custom engineering and fabrication. Anyhow, they explore trying to recreate the LFA sound (front engine rear exhaust) at 500 hertz via custom designed headers, xpipe, and exhaust. As always Andre delivers!
Go to 1:16:29-1:27:51 for the exhaust discussion.
"If you're perhaps hiding under a rock and haven't heard of HP Academy" and their podcasts, get on it!