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I know you ended up going a different route anyway. However, the reason that they don't work is due to the frame hardware on an in-bed hitch. The second tailpipe can sometimes come in contact with frame work under the bed. There's been times that it fits unloaded and then when the additional weight is applied there's clearance issues.
I just spoke with MBRP about this on Friday so the issue is fresh in my mind. There is some applications that you MAY be able to run a dual with an in-bed hitch. However, from MBRP's point of view they need to make a blanket statement and say it doesn't work for any of them because in reality, it won't fit 8 times out of 10. Secondly, because the truck has a single outlet off the turbo you'll find that duals really do more for looks than anything else. Hope that sheds some light on the issue.
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