I installed a Booster Plug on my K1300s. I put 10000km on it prior to the BP and another 20,000 on it after the install. There is absolutely no question that tricking the ECU into thinking that it is 20deg cooler has a positive impact on how the engine runs. Throttle response improved, it is a little smoother and the tone of the exhaust is slightly deeper. Paradoxically it has slightly improved fuel economy, many people have observed this effect.
However it is no substitute for a Power Commander or an ECU flash. If you are expecting a transformation you will be disappointed.
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