I installed the Magnaflow 12158 with Borla Performance tips ! Really like the exhaust note at WOT ! (Sounds like a Formula 1 from a dig outta the pits) The only drawback is a drone inside the cab between 2200 and 2800rpm when cruising.
Got in the habit of downshifting or kickin the tunes up to 40 when the drone becomes something I don't wanna deal with !

Just my Dos Centavos