Let me see if i can answer your questions. As for the tint, mine were done by the dealer. They suck, so the moral there is dont let the dealer tint your car. It was cheaply done. I honestly dont know. If i were to do it again, (and i may) i would take it to one of those rice shops here in town. Maybe CCR down on spring mountian. Thats where the kids go, but i hope there is a better solution. I dont want to send anyone there.
As for the flowmasters, there is a place in downtown vegas called chicks. They are on odgen and 7th i think. They have a good rep.
And finally service, right now i am doing my own oil changes and little stuff. When i have warranty problems i am taking my car into desert mercury. Although that is going to end. I am starting to take my car into the closest SVT dealership. I know vegasmarauder takes his to the one in henderson. I am going to take mine to friendly ford on decatur.
I hope i helped a little. When you find a good muffler shop, let me know. Hey, did you see my thread in the west coast area? I am trying to set up a meet on oct. the 12th here in vegas. Check it out.