Far easier and cheaper to sell your 8v, if anybody is dumb enough to buy it, then buy a 16v
8v chips on eBay, item number 221207075324. I have one of these on my 8v and could tell a difference straight away. Offer him £40 and hopefully yours will be a push fit chip and if not i get a pc repair guy to solder it in, mine cost £20 for fitting.