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I would flash after it is installed. Plus let the person know what else is done to the car when you order the flash. this will help them out. or do it yourself by reading up on flash. After seeing a email flash do nothing to the map but bringing down the fuel I would go to a local tuner in your area and have a custom one done. Also I would trust JustDSM to do one in the mail because he knows what he is doing. Just what I would do it is all up to you but a flash will help.
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SCOTT
EVO VIII SSL
313AWH 313TRQ
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