Yes the Magnaflows are straight flow thru and straight flow thru designed mufflers are recommended for X-pipes. As to the sound, I've never heard them on a mustang. I do have Magnaflow on my Lightning with an off-road h-pipe. I like it. Looks really good and looks to be made very well. Plus the Magnaflow I have is a 2.5 inch dual in/dual out with a X cross over in the center. It gave the truck a really deep tone. Sounds real good.
------------------
1994 Red SVT Lightning #2019
[This message has been edited by 96GTS (edited 06-24-2001).]