If you are going to buy a new engine as a complete package then look on the websites such as KKC, DK etc, they will sell you a new engine with all the ancillaries as supplied by JAG/Rotax at that time. It comes in a big box.
An engine builder will sell you exactly the same item in the big box, unless you ask him to dyno it and make it as good as he can by matching parts. For this he will charge and you may not get a lot of gain from the original standard item
At Kartmania, George Robinson said that there were no planned changes that were going to affect performance in senior max, they were possibly looking at the way the restictor worked in minimax but dont quote me and that was for later next year.
I think he also mentioned radiators might change, but again as for the exhaust, not compulsory.
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