They just came out with all-new engines - the BX and the BX-R - the latter would be the new top-of-the-line C6 equivalent I guess..

For buggy the older B6 maybe? They're in the process of updating their whole line. They came out with the Fire 11 last year, and have updated it again for this year - the RB Fire. Maybe the most powerful in their lineup? But not all the goodies of the BX-R..

Here in Germany they have some special edition engines that are supposedly similar to the old WS7II, but they're not sold in the US afaik..