4" down pipe kit worth it?
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Posting Guru
Joined: Mar 2016
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From: Missoula
4" down pipe kit worth it?
So I saw that Sinister Diesel sells a 4" downpipe for the 6.4L, and I was wondering if it is a worthwhile upgrade to the stock downpipe. The truck has a S&B intake, DPF delete and the EGR is currently disabled. Worth the $200 for the kit? Thanks!
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Posting Guru
Joined: Mar 2016
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From: Missoula
I actually just found a 5" turbo-back from flopro for the 6.4L for $560. I was told that the 6.4L could not get a 5" Turboback, so I'm guessing it's just more work. But is it worth it? Will it decrease turbo lag?
Fleet Mechanic
Joined: Aug 2013
Posts: 1,313
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From: Louisiana
In my opinion 5" is far too much pipe for just a everyday driver, and/or tow hog. The lag created by the lack of backpressure was extremely annoying if you needed to get on it. If I had to do it over again, I would do a 3.5" downpipe with a 4" straight pipe all the way back. I have had the truck like that for almost 3 years and I finally put it back to stock awhile ago and believe it or not, it is much smoother driving it stock.....
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