I am very new to this fourm, as well as the the modifying world. I have a 1998 Durango SLT with the 318. This will be my first aftermarket part for my vehicle, I am looking for the best exhaust under $400 (before installation). I would really like to have dual exhaust but if a single would work good, then that would be fine. What I would like to get from the exhaust is a good MPG increase as well as a good HP/torque increase. The sound of it is not that important, but something that is a little louder than stock would be great, but I do not want something that is so loud that every little kid in his modified four-banger will want to race me. Any help or suggestions that anyone can provide would be extremely appriciated (ie: brands, places to buy, etc.). Thanks!