I have been through sever AC CDI's (2pins). I think I notice slight performance increase (I haven't compared the two statistically with results of my buggy). In my experience from a few different vendors, it isn't worth the money. My latest experience with one aftermarket CDI was somehow it prevented the engine from starting. I was getting significantly lower readings with a multi meter compared to the stock CDI. So if you ever come across your buggy not wanting to start, you're getting fuel and a weak/no spark (exactly my situation) it may be worth your time to check your CDI/coil. If you do decide to buy an aftermarket CDI, keep the old one handy. Mine died in BFE, long walk.
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