I've spoken with them before as well as one of their VX customers and the improvements they offer are neglible at best. No removal of top speed limiter and no change to shift timing. $300+ for a little bit of horsepower (if any) is not worth it. They DO have to open the ECU on the VX as they actually replace the chip since it cannot be flashed in the unit like many others due to language issues according to them and other programmers. That was another concern as you have to send them the ECU and then wait to get it back.
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