I am now the proud owner of an 08 F150 4x4 5.4! I am looking to do exhaust first thing but im torn right now between going true 2.5" dual exhaust with Magnaflow magnapacks or single 3" with a magnaflow magnapack. I have both size mufflers already, which way should I go on this for best performance? Im going to be going side exit in front of rear tire. Thanks!

 

True duals with x pipe, exit in front of pass rear tire and 4" tips @ 45 degree angles.
Looks nice and sounds great!!

 

For performance stay with a single system. For a sweet sound get true duals.