First let me thank you for any response to my thread ahead of time. I am sort of new to the game. I have a boring 2004 (305-555) 2500 six speed 4x4 that has cold air, bd power pup (extreme), silencer ring removed, dixie air horn. Don't get me wrong I like the mild horsepower, smoke, whistle, and of course dukes of hazard horn. I just want more. I am seeing what you think I should do. Can I stack with power pup? Straight exhaust? I am running a stock turbo, stock injectors, stock exhaust, stock six speed. I don't need more smoke but if it come with the added power that is cool. I just wanna go fast and still be able to tow sometimes. Thanks again.