You may not feel the vibration but it does do it, the majority of engine vibrations are damped by the rubber suspension bushings. The big problem is it putting uneven pressure on the variator this can lead to very quick wear on the belt, especially if you're still running a stock belt. Definitely get a gates or bando. It's the number one recommendation on the first part to replace. The belt is nearly impossible to replace on the road so if it breaks you're stranded. That's why you shouldn't run with three weights.
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