Thanks to Crow, I have a set of Direct Hits.
For me they work. My plugs are a way better colour, and my motor has lost the little hesitation it used to have. The top end seems a bit more willing too. But that is seat of the pants stuff.
Gas mileage I can't comment on. I don't keep a register of MPG and as our petrol prices are rocketing daily, just having reached an all time high, It's just too much trouble for me right now.
I spoke to Figmo while ordering a cam, and he says yes, they do improve mileage.
Just having better coloured plugs and no hesitation is enough for me.
My zook runs 5000 Rpm at 62.5 Mph so MPG aint that high on my list.
I just accept that it sucks like a rotary or V8.
I reckon these little doodads are OK.