They're both fuel system cleaners. If you always use quality gas they shouldn't be a necessity. Both brands have a "maintenance schedule" though, BG recommends using the 44K once and then use their Supercharge II at every fill up. Redline says to use one bottle to a tank for cleaning and about a eighth of a bottle at each fill up after that. Try em both and see if you feel any difference, its much more important to run good gas and replace your filter when it's time, that's about all there is to it.
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