Not all sled platforms are designed for racing, plus Polaris has a very good one already. I have heard nothing but good things about the Rush and I have driven one and was blown away! The engine was amazing. There will always be those that have complaints, but I sure haven't heard any. Funny this is coming from Cat guys!?
I checked with my local dealer, Midcities Motorsports, They confirmed they have 4 badly performing Rush's in service. Reflashing the cpu's didn't help I guess.
They backfire, go faster at half throttle than full throttle, and run rough. Sounds like a typical Polaris engine. Not trying to bash Polaris (cause I don't really care) but isn't part of the fall ritual to take your Polaris to the dealer for a re-flash?