My lbz has been smoking quite a bit at idle since new. The Dealer says its normal and there is no reflash etc to fix it. Well I got the power pup today and reprogrammed it and took it for a test drive on Tow haul, runs smartly pulls nice, about what I wanted. Later on after several stops around town I noticed, no more smoke/smell at idle. I hope it stays that way, as before it was pretty bad.