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Thanks for the reply !
The pics in the pdf look very similar to the pics I viewed on this site which led me to my original post here.
Lets take the egr carbon build up a step further - hypothetically, if the main runner is open on the underside of all the "ports", why would carbon build up on the underside of any/all of the plugs be an issue ? Seems like the build up would just act like a little deeper plug...
Do you know how it is that the carbon affects the performance of the vehicle technically ?
Thanks,
Douglas
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