Mark Craig said:NLeach,
The Dodge is a different beast as compared to the PSD, no low end loss. 4 inch will support up to 500 RWHP easily. If you have a 2004. 5+ (sig didn't say) you already have a 4 inch system save some money and get an MBRP or AFE direct replacement muffler and save the cash for other mods, you do know it's a disease don't you???
Mark @ DPPI