This is weird as I'm in exactly the same situation.
There had been so much done to my donor i've got no idea if it had an unleaded head or not (everything else seems to have been tinkered with!) so at the moment I'm just using the additive in every tank, although as has been said, it is quite expensive so if this ball thingy is a cheaper alternative then i'll gladly give it a go. Anyone got a link to one?
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