Quote:
Originally Posted by ///BMW Junkie
Piggyback or a true ECU flash, it doesn't matter. BMW NA can detect either one if they look hard enough. Higher boost, higher speed limiter, higher redline are just some of the parameters that give it away. And for those thinking their SA matters, once a expensive warranty claim is made, a PUMA case is opened for BMW of NA. Getting a separate ECU is the way to go if worried about the warranty.
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That's what i figured.
I invested a couple of years in the subaru world and i know when you flash your accessport it's recorded permanently. Doesn't matter if you go back to stock, there's a code that's recorded into the ECU basically telling anyone, even the tuner, the stock tune has been changed once.