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Not very common as you say.......i know R5 GTT's have them, but then as soon as peopel start modifying them they disconnect the second connection anyway, if it was a serious tuning advantage im sure all the top boys would have them..............
Yeh, im quite surprised no one has them as they seem quite a good idea. if they were made specificaly for Ford then i would get one but i dont fancy DIY'n it to fit.
In the US they make them for all the Jap cars, and they make universal ones also, i just dont fancy DIY'n it to fit. I would like to try it just to see if its ne good.