Heres a good system.
Magnaflow
PART #: 16608
YEAR: 2006
DESCRIPTION: V8 5.4L Harley Davidson Series Pickup
5 x 8 x 18in. Dual Outlet Muffler, 3in./2.5in. System, Dual 3.5in. Polished Tips, DUAL SIDE EXIT.
Material: 100% Stainless Steel
Tubing O.D. Size: 3in./2.5in.
System Type: Cat-Back
TIP O.D. Size: 3.5in.
TIP Quantity: 2
Single/Dual: Dual Tailpipe
Exit Position: Dual Same Side Exit Behind Rear Tire
Features and Benefits: Lifetime Warranty, Dyno Tested And Proven To Make Power, Performance Gains In Horsepower And Torque, Great Sound -Has A Smooth; Deep Tone, Easy To Install, Mandrel-Bent. All Welded. Built To Last.
Sound Clip
Ford F150 Harley Davidson Supercharged Sound File