I've got a booster plug for sale which is like new in original packaging. Label says fits 2007 - 2016 Versys 650.
Was fitted to my 2015 V and it did make a difference (I think I posted a review on here) but I've removed it and decided to live with the standard bike, partly because I'm thinking of selling next year and want the bike to be back to standard for the sale.
Looking for £60 (as I said it's as new) . Prefer to sell to forum member, but if there's no interest I'll stick it on ebay.