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  1. S

    raise compression pros and cons

    Just be aware of the associated costs of the new tuning, and the fact it's going to be difficult to know exactly what compression you will end up having. There are also other ways to acheive a different compression ratio, each with different positives and negatives, such as different pistons...
  2. S

    05 Speedo has gone crazy.

    There is no way to know for sure whether it is a sensor or a wiring issue, but the Mustangs after 2000 have often had issues with the speed output sensor located on the transmission. There is more here, it's a fairly common issue.
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    cooling

    I'd just make sure your stock fan is working correctly [like the clutch actuating at the right time] and no fins are broken/damaged. Beyond that, try to get an aluminum radiator or one that is higher capacity. Filling it up with engine ice or water wetter is also a good idea to increase...