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Carbon build up is something that can and will effect any engine equipped with DFI, not just the RS4 or Audi. Though that said I have owned 5 DFI engined cars and never had a problem with any of them, meaning I think the issue is a little over stated. The same can't be said about the DRC system in both the C5 RS6 and B7 RS4, though I believe a redesign of the system in the C6 RS6 which early sign seem to indicate that it's pretty much problem free.
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