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Personaly I don't think the powerstrokes sound that great with straight stacks due to the v-8 motor configuration. The dodge with a cummins on the other hand sounds good just like a big truck. Thats just my opinion though good luck with what you decide, and I want to see pictures.
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The guy around here that put them on his dodge's used regular 5" big truck stacks, it might of given his a deeper sound.
I am short on money right now, so I have decided to just go with a replacement 3inch exaust pipe/muffler... Will help power/torque out a little. After I save up some, I'll look into the stacks... Cause that would just be super cool!
I have a buddy that has straight through exhaust on his 7.3L, it sounds awesome. Also saw a Dodge on Sunday with stacks.....looked ok, but was a little much for my taste
Some guy I used to work with had 7'' stacks on his Cummins ram , and it sounded exactly like a 18wheeler. If I had a pickup , I would def. do the stacks.......
I saw another Dodge with straight pipes the other night. It wasn't as loud as the 7.3, but it still sounded pretty good. I also saw a '94 F-250 N/A Diesel with straight pipes last night. It sounds stock at idle, but when that feller took off, it sounded like a regular gas engine with straight pipes except for the compression/combustion "trademark of a diesel" sound.