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The Buzz overlanding seem promising. The original way to do it was to send ECU out for unlock and have a company bench tune. Meaning you could not tune via OBII, so I'd be curious if Buzz's tune is this method or not?
Why?
An actual flash tune done correctly is much more safe for the engine than piggy. A piggy literally just fakes out the signal you are sending to gain just more boost. So basically simplifying it if say the engine is expecting 5lbs boost the piggy will say oh no I'm only getting 2.5lbs then ECM will allow for more boost. Most are done in a way its kept as safe as possible but a real tune the entire engine management system works without getting tricked and is exactly as the OEM tune operates just with different mapping. There are some really awesome Youtubes and articles that the pros go way deeper on explaining all this much more detail.
