Although I do not have a supercharger, I'm voting based on what I've learned here. ESS has sold the most units and I personally have not read of one single issue related directly to their kit.
I cant say that about the others.
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"But resist we much; we must; and we will much; about that be committed."
~Rev. Al Sharpton
2010 E92 M3|Silverstone II|M-DCT|NCSW|2MT|ZCW|ZPP|ZTP|302|507|Gas Guzzler Tax
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