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My 32 had the Renntek crank pulley and ECU. Later it was accidentally re-flashed back to factory during one of the recalls. Do you think it is necessary to send the ECU back to Renntek or just leave it the ways is? The car drives fine.
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Contact RENNtech and have them reflash your ECU. They should do it for free (you just pay shipping). You have already paid for the tune and it makes a difference.

I think the ECU upgrade is worth every penny. Pulley is the biggest bang for the buck and the place to start but I recommend doing the ECU also.
 
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