Exhaust diameter -Mpg

Chasin' Tail · #1 (**permalink**) 01-04-2011, 10:43 AM

My delete pipes are stock diameter and I am still running stock tailpipe. Would a larger pipe help mpg, I wouldn't think it would do much other than lower egts but Im reaching for some better mileage.

**08stroker250** · #2 (**permalink**) 01-04-2011, 10:49 AM

Doing a 4" downpipe into a 4" downpipe back exhaust with no muffler might help some, but I wouldn't think it would be anything major.

Chasin' Tail · #3 (**permalink**) 01-04-2011, 10:55 AM

How big a pain is removing and installing the downpipe? I cut my 6.0's off to make it easier, don't want to do that on my 6.4. Thanks

**08stroker250** · #4 (**permalink**) 01-04-2011, 10:58 AM

There is a way to do it without cutting it, but I think it involves moving the transmission over some.....or you can pull the cab to replace it lol

I just cut mine. If you get a ball and socked style downpipe, it will bolt up to your DPF if you needed to go to the dealer for anything.

stngh8r · #5 (**permalink**) 01-07-2011, 10:51 AM

what diameter is the stock tailpipe (DPF to tip)?

Thanks
Eric

**08stroker250** · #6 (**permalink**) 01-07-2011, 12:55 PM

The stock exhaust is 3.5"

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