Actually if you know about soldering a bit and can follow simple (but at times weird) instructions you can DIY.
1) Manual and software
2) AVR CAN Module - 36 Euro
3) Pair of connectors - HR30-6J-6P, HR30-6P-6S
4) About of 1.5 hours of time and some luck! :)
My KTM ecross (250w) has been...