Just to provide an update, I swapped out the old BBK 1 5/8 shorties for a set of stock 86-93' HO headers and it actually made a difference. I've noticed that I don't have to accelerate as much to get up to speed and overall, the car has more torque from idle to 3000 rpms from what I could feel. That is the typical rpm range for my aod stang during normal driving. IMO, for those who have stock untouched E7TE heads, the stock HO headers are the best option, at least in regards to shorties. Sound wise, it is very similar and it actually has a bit more BRAP to the exhaust note when I rev it and it seems to purr a bit louder at idle.