0,5l/100km less fuel consumption, consistent, and what is most important, my Golf was the only car that started by itself this winter at -30 C outside, among about 30 cars in our courtyard.
I highly recommend this one: It gives probably the hottest spark out there, is a direct replacement to oem coil and is not expensive (~$30).
It's Bosch KS with a turbo 5K coil. The turbo coil is known to work very well for 18+ PSI, and I am firing it earlier in the cycle than most, which should make the job of sparking easier.
Get the Bosch Blue coil either way though.....
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