There is an owner currently fabricating a mudguard for the Super3 - its quite complex as there is not much room between tyre and Liner. He is on the second version already as has improved the fitment.
Its quite complicated under there and wasn't helped by MMC already changing the position of the wheel sensor between the demo cars and the customer cars.....so the mudguard had to be redesigned.
Once it has passed his testing regime I'm sure the mudguard will be available to others - it won't be cheap as its a quite complicated piece of fabrication, but it will be worthwhile.

I'm sure KH will have an exhaust upgrade in due course - they do not use Demand Engineering anymore (or didn't on the 5 speeder exhausts).