experimenting

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    Mercedes Performance ECU upgrade, experimenting with a C200K.

    Has anyone had the ecu upgrade for a W203 C200K? What results did you get? Having read their website is a pulley upgrade necessary when they quote a gain of 40BHP just through the ECU? Is it such a bargain at £250? I'm now thinking do I need the bigger pulley for more power and have tried...
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