I run an 82 RT and have never bothered with the additives, I've done 40,000 miles on it myself all on unleaded, every 5,000 miles or so the right hand exhaust closes up. I can tell this because it suddenly wont idle.The other 3 are always fine. When I have time I will have them done. Why not do what I did with my 81 G/S with 151,00 miles on it - and have them done when there's no valve seat left!
My point is they wear out anyway why waste time and money only for them to need re - doing every 80,000 miles anyway
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