@elan-n Too much to list.
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I've done basically most things to it, the thing that's impressed me the most is specifically the Zeeltronic ignition system. I have like 5 of those CDI units now as they're excellent! I fit them to all of my bikes. Single biggest bang for buck.
I've done everything to it: https://www.youtube.com/watch?v=jZ1C_xCmqWg&pp=ygUbVGhlIGxldmlhdGhhbiBQcmplY3QgZHQgMTI1 (build video).
I've ran TZR R 4DL Belgarda setup, to ported Athena 170 kit. I'd say, if you dampen your expectations, then the Athena kit is next inline (after exhaust setup). This is because, whilst it's not rip roaring tear your arms off performance, it gives you more low-end grunt and that suits my setup better.
I have my RS for all out smoker power.