im not really new to the car scene but i am to the truck scene. i have just recently purchased a 2003 dodge ram 4x4 with the 5.9L. im wondering wat is the best cat back exhaust systems you guys are using and best cold air kit.....that and headers are the only performance mods i want to do to this truck. thanks guys.

Kevin.

I don't know much about the 5.9L but here's a few ideas. The stock exhaust should be 3" mandrel bent pipe so if you want to save some money, just replace the muffler. The popular brands are Magnaflow and Flowmaster. For a CAI, there's K&N & Volant for starters. If you've been around, then you probably know these names already. I would go to DTW or DTC and do a search or ask there, probably get more information on the 5.9L..
Jim