I noticed on that other thread people are comparing backpressure on a gas engine to a diesel. We all know that on a gas engine a certain amount of backpressure is desired for optimal performance. My knowledge so far is on a diesel the less back pressure the better, in every aspect minus noise but even then I dont think it would be that bad since I drive a 5.9L Cummins with 5" stacks straight piped behind my head. On the turbodieselregister.com which I am a member of, people who want a lil more performance to their trucks put on a civil lil system and it helps a lil and the sound isnt bad but for anyone who wants lower egts, better mileage, (sound), and a system not getting filled with soot from literally pouring fuel down the engines throat from the performance diesel tuning today straight pipe is the way to go for most.

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1976 300D 115 Blue Grey exterior 95K miles


2004 Dodge Ram 2500 Cummins Silver exterior 5"stacks etc...