Post up your exhaust setups and videos Stock Headers Y-Pipe 18" Cherrybomb Glasspack Single exit in front of rear tire. Truck FlyBy.wmv - YouTube Spinning Doughnuts - YouTube
stock Y stock cats(4) cutting out rear cats soon 2.5" piping into 3" flowmaster 10 si/do 3.5" tips (cold start)
Going to make this a little more informative. Stock pipes are 2.5" in diameter. 2004-2005 have 4 catalytic converters. You can delete the back 2 cats with no bad effects or codes thrown. 2006-2008 have 2 catalytic converters, then a y-pipe, then a giant muffler. Largest pipe size recommended is a single 3" or dual 2.25". Dual 2.5" works also, but you lose a little low end. Mufflers: You get what you pay for, the more expensive it is, the longer it lasts, and usually sounds better. A popular cheap option is Magnaflow. For any chambered muffler, length=noise. Shorter=Louder. If you just want a good sound, get 18" or longer. 14" and 16" mufflers are pretty noisy. X-pipe vs H-pipe: Get an X-pipe. Better sound and flow. Basic physics Exhaust Exit Locations: Stock Harley Style (Dual tips, stock location) Dual Rear Lightning Style Cowboy Style (Dual Rear, but usually angled 45*)
Headers You can buy long-tube or short-tube headers. Short tube are a direct replacement for the stock manifolds and flow a little better, but not enough to make them worth the time and money. Long-tubes are more expensive but give you more torque and a little more horsepower. Any shop capable of installing the headers should be able to connect them to whatever exhaust you have. Shortys vs stock manifold Long tubes The most common high flow (aftermarket) catalytic converters are made by Magnaflow and cost under $100. Amazon.com: MagnaFlow 53000 Series Universal Catalytic Converters (Round) - Cat 2 Inch IN/OUT (NON CARB COMPLIANT): Automotive
Im running a full exhaust system: OBX SS long tubes with resonators in place of cats Dual electric cutouts Magnaflow X-pipe Dual Borla XR-1 race mufflers Currently dumped, I have had it with Lightning style tips https://www.youtube.com/watch?v=TeFJE181Pe4