According to KTM, the EVO4 is designed to work with the RC8R Club Race Kit as well as the Superstock and Superbike engine kits only.
Also, it's important to note that the installation of the Club Race Kit ends warranty coverage for the bike receiving the installation.
The EVO1 does not require the kit and does not affect warranty coverage.
Another difference is about $900 less for the EVO1.
Peformance wise?.............
Since the kit came with my Akra, that's what I'm installing.
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