got an 02 f150 with a 4.6 what would be the best exhaust performance sound and what not also what is the difference betweeen having a long straight through muffler compared to a short one? thanks

 

The longer the muffler, the more muted or quieter it is. As far as best goes, you have to define what you consider best. Most power or best sound? I love the sound of Flowmaster 40s, but yuou lose some low end. Magnaflows give you the low end but are too quiet for me. Might as well be stock.