I have a 2004 Silverado SS AWD. I have installed and cold air intake and I have cut out the stock muffler and replaced it with two thrush glasspacks. I love the ways it drives and sounds but I am wanting to get a lilttle more kick out of it with out spending a fortune. I also dont really want to go to nuts as seeing it is my daily driver. Is changing the thermostat to something colder and option, or is it just hype? Any ideas????