Try standing on it once in a while-That explains why they have never had an issue. Hence why I said it probably doesn’t hurt anything. I agree though the only way to really get it off is walnut. Or add meth injection. That stuff will clean the dirtiest of valves very fast. One guy on the focus forum showed before and after and I was shocked. But the carbon does get very soft when hot which is when most meth would be sprayed so that makes sense.
It truly does wonders for a 4 pot, DI TURBO...
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