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The Ultrik 3 piece pulley from Mini Mania is what our local dealers are installing (Sterling Mini & Towson Mini), and I've had mine since March. The dealers also install the smaller belt recommended by Mini Mania, their website sells it as a package to include the belt. Check out the Ultrik warranty on their site as well, one of the reasons the local dealers are using their products. I haven't had any pulley/belt issues, and I haven't heard any of the other folks with any issues either.
iv'e had mine on for about 6 months or so, maybe longer, 8,000 miles and no problems. Great mod and the ultrik warranty gives great piece of mind. If you check out other products offered on the site you'll they're very mindful of the cars life and encourage smart mods. I actually just looked at the site the other day and saw that they have a "boost kit" or something along those lines witch gives you the belt, pully, unichip or shark injector tune, and spark plugs for about $550 or so, and is good for about 25 - 30 hp
has anyone spoke with a mini mani rep regarding their warranty.... specifically their 15% pulley and possible damage to the supercharger. did they say that if the supercharger goes bad (bearings) will mini mania pay for a new supercharger + installation????