well you can get a 4 inch downpipe from a lot of places. Then you could just go and get enough 4 inch pipe to go back to where you split for the stacks. Beans Diesel Performance sells 4 in downpipe pretty sure
If I had to do it again I would have gotten a 3.5" over my 4". Too many fitment issues. Not sure about performance difference, but can't be that much until you get ALOT of ehaust flowing.
exactly! its not worth the trouble. 3.5" is more the sufficient!
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