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is this 1 of those "too good to be true ads" or does anybody know if they work? all thoughts greatly recieved.
Is that the one that one of the classic car mags tested and they saw massive valve seat recession, in fact so much, they said the thing did absolutely nothing and the result was comparable to just sticking unleaded straight in?xlr8 said:
btw
I bought a classic car with a similar device fitted a few years ago....supposedly turned 4-star/LRP into unleaded
& was sold in the same way with same performance claims