I need to know how much it is going to cost to run exhaust on my truck. I have a chevy 1 ton and I want a burly sounding exhaust to where I do not loose too much gas mileage. I love loud exhaust but I know that a lot of times, you loose mpg's with it. What am I looking at for a price. How much does it cost in materials alone?

I have also heard that some chevy trucks do not loose gas mileage when you put whatever exhaust you want on the truck. What trucks can do that? I'm hoping my truck is one of those trucks that can get away with doing that. Does anyone know what trucks you can do that with?