Click here
for info on these.
Or if you want cheap, get a set of 5.0 Mustang headers and see if your exhaust shop can deal with the sharp bend to clear the frame on the pass side or cut the collector off and re-position it to point at a better angle.
The driver side may have clearance problems with the clutch linkage to deal with if you have a manual tranny.
Hedman makes a nice set of 3/4 length shorties for about $180.00 a set, but I here there are also clearance problems with those and the shift linkage to the column on an auto.
These are just small issues to me, just takes some thought of how to deal with it, other people are using them so they must be able to figure out a way to get around the clearance and fitment issues.
I've also found when I want cheap I end up spending $$ on making it work and almost as much as if I would've just got what fits in the first place, this isn't always true but most of the time.
Good luck, Francois.