Ive ran the PPE on my 04.5 since new and always really liked it, id agree the service there at least over the phone is not that great though. Ive made a tick over 500hp with it, it tows really well and i can get over 22mpg, it is a 3500 SRW 2WD though. I was suppose to have a Smarty coming long ago to try for a couple weeks but it never showed? No biggy, the PPE on the 215 tune stacked with the Dr. P box for some added pressure would be hard to beat, never dyno'ed since thier box but it stays off most the time anyway, its very touchy on the street, prob. would drive better with the 85hp tune from the PPE on the street....