OP: Once you go SC, you will wish you did it sooner. It's a head rush! I strongly recommend it.
Pros: Awesome power, transforms the car above 5,000 RPM. Hang on! This is how the car should have been designed by BMW. Very docile, like stock below 3,000 RPM.
Cons: SC Expense, cost of gas and tires, GF or Wife will think you are obsessed, tickets.
I've got 14K on the odometer and added the SC at 7K. I haven't experienced any negatives and I tracked my car this very hot summer. There are several good SC's available and excellent installers throughout the country. I chose iND to perform my installation.
Good Luck with your decision!
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Last edited by CBS; 10-01-2011 at 12:24 AM.