No traction additive needed, they are *really* sticky. (i have a FWD set on a 410) By comparison, the Panther T790 (?) slicks are like driving round with grease smeared all over your tyres (so additive is needed).
Don't think they will be available in the UK, they are a specific "Swedish VBC" compound, its even embossed onto the sidewall of the tyre. Give onekiwi a shout, or order from Sweden/Scandinavia, postage should only be a few quid.
I'll probably be getting another set for the 2wd at some point........
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