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Originally Posted by crosvs
There *DOES seem to be piping running from both the left and right cylinder banks suggesting a "true dual" setup; however they then merge into one ... catalytic converter? ... and then split back out again into two mufflers each of which have the twin exhaust.
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My understanding is that all V8 exhausts are the same. I was able to install the same 2.25" Magnaflow Tru-X 10790 x-pipe on my 4.8 that others have installed on their 4.4's.
What may appear to be a single straw, actually is a true dual setup. Please scroll down to the bottom of this article by DanDE on his resonator removal and exhaust modification to see the photos.
http://www.xoutpost.com/articles/x5/e...-x5-4-6is.html
The factory resonator is actually a single glass-pack muffler with two tubes running parallel. The tubes are perforated in different places to allow the single 'can' to do its job.
Make no mistake, you have a true dual system!