Well yesterday i was on the way home with a buddy and stopped to get a couple of spare keys made... A Roush charged f150 pulled up 2006. i asked if if he wanted to race and he laughed at the ole 2005 5.3 with a cai and nelson tune =). we hit it from a 30 punch to around 90 or so and i beat him by a car link =) he said he paid 56000 for the truck back in 06 but still i won which surprised me but the bad part is my buddy was behind me in his truck and he said when i punched it white smoke came out of the tailpipes just a decent size cloud but after that it was good. truck has a 5.3 122000 miles. it seems to be running fine. no leaks. oil was just changed a couple of weeks earlier. mobil 1 synthetic is all it sees with 93 octane gas. what do yall think? should i worry about it?