well, that was easy. hardest part was getting the band clamp off, it was turned so the nut was well behind the turbo outlet. biggest thing i would recommend (and it was mentioned earlier) spray the hangers with lubricant, i used PB blaster and they slid out no problem. i cut the hanger rods off the old exhaust also so i only had to work with those instead of wrestling the whole exhaust. cut the old exhaust into 3 or 4 pieces for easier handling.
the 4" doesn't leave much room between the spare tire and the rear shock, not sure what you'd have to do if you put 5" on.
not much louder than stock, but you can really hear the turbo whine
seemed to improve the throttle response (or maybe it is my imagination), i did notice at idle, the EGT's were abot 50 deg cooler and running at 60mph showed egt's at about 525-550. if i remember correctly, they were running at about 600 with the stock exhaust..
as a celebration of a job well done, i layed a 1111 at the end of my driveway. i should stop doing that, tires can get expensive..