Can anyone tell me about the Modified Novarossi "N21R Limited ? Is it any good is it worth the money? What did you think about it?

I have a couple pro racer buddy's up here in WA st. that run the N21R's in their Losi Eight 2.0 buggy's and they swear by them. I got a couple hand me down N21R's from them but I have not been to the track yet. I have a Losi Eight 2.0 with the N21R and a HyperST Pro Truggy with a .21 Novarossi Nitrotec that I can't wait to test out. I'll come back and post with what I find out. One really cool thing I did with the HyperST Pro is I installed the Losi 4 shoe clutch on that Nitrotec. I had to modify the chassis plate because the clutch bell is so fat it wants to move the engine back about 3-4mm so the clutch bell spur gear will hit the center diff ring gear in the right place. I can't wait to test that combo out. I'm still trying to figure out which exhaust and manifold I'm supposed to run on the truggy.