I have a 5.3 with a K&N cold air intake and was wondering if the custome tune was worth the money and if i did get it, could it mess up my truck in anyway? The cheapest place iv found is PCMforless and i was wondering if i sent my stock PCM in later would i get $125 back or how does that work? Also is it hard to install or how long would it take me and a buddy? If i sent back in because of different mods what would i use till i got it back? i havent heard anything bad bout them but iv only read reviews on there website.