Last time I spoke to him which was well over a year ago, maybe more, the issue was that his design incorporated an air pressure sensor that had been rejected due to its manufacturer/marque. I think it was something to do with Volvo.
I know he is active on the Facebook groups but I think the timescale for any KV6 engine mods, in particular a complete overhaul of the VIS system, is long passed its viability window.
Given the cost of the system too, being similar to 75 and ZT eBay listings, I doubt there would be many takers.
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