I didn't get a top speed with the race groove. Weather didnt permit a good test. For me its worth it to change it. I would take it apart again to change it. It's not so much the change in top speed as it is the overall performance. The overall performance improved alot. The cvt responds much more like it should. The choice is yours but I wouldn't recommend that race groove. I looked on the specs for your buggy and it claims a top speed of 43mph. When (if) you take it apart take a look at the marks on the variator and see if the belt is making it to the top. Does the dr2 come with a drive face too? And if so does it have that little lip that keeps the variator halves apart slightly?
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MXR TrailBender 160R
SYC Perf head P&P,Matched intake and exhaust, A12 cam, Orange CDI & coil, Motorio pulley, 115mm Variator and lightweight drive face,11gm Sliders, UNI, modded muffler + 200 horsepower 
http://www.youtube.com/watch?v=3hx-hEWl10c
I'll take your insults as compliments and blame it on your lack of intelligence.
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