Well I did to myself for xmas. Traded in my 03 4X4 screw for an 07 Lariet 4X4 screw 6.5 bed. I am now ready for an exhaust but after reading the recent forums I am undecieded between one of three. Magnaflow 16612, 16614 or Roush with any of the three being SI/DO. I also would install myself. What do ya'll think ?