I brought a batch from John the other week, and after about half tank there was a noticable difference on power pre turbo. Its good stuff!
I gave some to a friend to try, and because his car is non cat (hybrid RS Fiesta circa 200bhp), he doubled the concentration ( [img]images/graemlins/shocked.gif[/img]). His car went instantly faster, but now pops and bangs at high revs. Mine is also is a bit lumpy at idle.
Has anyone else came across this???
Millers Octane booster
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