Ive got 2 vipers, standard and black edition and i'm really happy with them the solder posts are good, seem to be a little bit easier to solder to than the tekin rs that i found cramped. the progauge is really spot on, so simple to use. Adding timing advance is easy, and adds massive amount of power!.
On the negative side, they don't run sensorless like the tekin did, so a damaged sensor cable stops the car, and they seem to run hot in practice mode (allows reverse)
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