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Those chips do actually work but have to be soldered into the ECU which isn't hard but it's not for the faint of heart. The dyno graph they display is blatantly fake lol. I believe this is a direct copy of a Renntech or PowerChip tune that was available in the early 90's.
There is a really old thread in here somewhere with a 500sel or 500e owner commenting on the gains he saw from adding the chip. He liked the difference he felt if I remember right. Problem is that chip will NEED the engine to use at least 93(R+M/2) octane fuel to avoid detonation.
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