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RG, I’ve gone over the install a number of times hoping that I got it wrong. The installation is fairly straightforward. A to the right side, B to the left, and connecting and locking down the connectors. The display comes on, got it dialed up to 7, but I feel no difference than when it’s dialed to 0. I had piggybacks on a Panamera Turbo and a e63s, both had significant seat of pants hp gains, but this one doesn’t. Beginning to think the 21’s got the piggybacks locked out too.
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