Superwes.. If it were me I would go with a nice set of long tubes of equal length. Diameter depends on the insides of the motor, if your stock go with cheap bolt ons, I personally don't have a problem with some BBK headers, seem to work well on eveything I've put them on..
Another question I might ask is; could the "missing torque" be a timing/tune issue to begin with?
Hurst... People like you and me don't have big money motors that are already tweaked to the max. In those cases a dialed in exhaust to the engine I could see.
When I'm working with a car that only has one manifold choice like a Ford Escort or Focus I definitely have to tune for the manifold. Especially on a SULEV vehicle or even a late model OBDII.
If we were talking old school carb with the room to move runner lengths and diameters that's also a different story
In the case of this 5.0 with the old school computer you can get away without a tune but I bet money you get more with one.
Man every post I make seems to get anally probed lately
Oh well one day someone will understand that I do actually know what I'm talking about for the most part....Years of training, EFI classes, dealership experience and tech support to other dealers mean something somewhere I'm sure...