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I don't know much about flashes. Below are the pros and cons that I can see from what I've read:
Pros
1. Cheaper
2. Invisible
3. No taking your car apart to install for flashes uploaded via OBDII port.
4. The right tuner can work wonders.
Cons:
1. You either have to take it to dealer to flash; or
2. If you flash it yourself a mistake in uploading could be very expensive.
3. If you have to send your ECU off to have it flashed, downtime for your car.
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What do I know? I'm insane. 
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