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Message: [QUOTE="Notneb, post: 1357763, member: 22077"] So far, the only real difference between the tunes is when the boost comes on. Shifting is pretty much spot on through all the levels so far, with the 600QR being my favorite. I found there to be only one area where I could make the truck shift HARD and that was when I was at WOT during the 2-3 shift and broke traction while the traction control was on. That's where I was ranting about the damn TC being on during the second part of the video. One other thing, there was a slight "flare" when I put the truck in cruise around 45mph, the truck seemed to "hunt" between 5-6 for about 1 second. This happened on the 450, 500E and 550E. Haven't had it happen on the 600QR yet. As far as power delivery, 450 was my favorite for around town cruising. By far the smoothest at the 20-45mph range. The 600QR always seemed to want to encourage bad habits... whereas the 450 just felt at home cruising. As for the 500 and 550 i didn't really find a noticeable difference between these during normal driving, but when you're at WOT there's a huge difference up top. I found a 5psi *correct me if I'm wrong* difference between 2-3k rpm between the two. Just a real seat in the pants feel, don't quote me, my ass-ometer isn't calibrated. [/QUOTE]

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