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The only two that I know of that give you a significant increase in HP/TORQUE are
1) Hartge
2) Dinan
Both equivalent in power increase. Hartge more expensive but I would rely on them more than DINAN since they have been a BMW tuner for an extremely long time. Was also told by Hartge that the Dinan tune is only a software upgrade while the Hartge tune is a completely new ecu module with wiring harness etc etc etc. which i think might be more reliable in the end, but thats my take on it.
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