It can be reflated via your phone in about 5 seconds.
There is no trace left behind, however, if Lexus dug in they could see that your vehicle was producing more boost than it typically should.
I have tuned about 5 cars (all with JB4) over the years the LX, the new Supra, and several bmws. I have never had any issues, but that does not mean that something couldn’t arise.
From my understanding, and I am sure others are more knowledgeable with a piggyback tune like this, but it basically fools the vehicle to provide more boost. As opposed to flashing an ecu which makes permanent changes until reflashed.
With the piggyback, the LX may be producing 10lbs of boost, but the car thinks it’s on producing 7lbs (due to the piggyback), so it adds more boost.
I have been told that if a manufacturer digs deep enough into the data, any tune can be discovered. With that being said, I have never removed any of my JB4 tunes when in for service and have never had an issue.
