I just had the dealer flash my ecm and while i was driving home without any of my mods on i noticed that i think i have a little more smoke.

Could i have had some kind of downloader on the truck and not have known it or do you think it is just my imagination?

Its a light but obviously black brown hazz, do you think that sounds like RV275s?

Not sure what all was done to the truck before i had it.