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I think its full of SH$$ to be honest. I hope someone buys it and post the results........LOL. It is hard to plug and play our ECU or any other device in our rides.
I would be skeptical of this, but since it plugs in via the service port, I suppose there might be a way for it to modify certain ECU parameters. In any case, being the gear-head that I am, I sent them email requesting dyno charts and asked what kind of guarantees they offered. I'll let you know when I hear something.
Pro-Tech also makes TC. You GS3 people should check it out.
About the chip, we've seen more companys making the performance chips for Lexus by time. However, nobody has ever tried JET and Pro-Tech mainly because there is no dyno for the particular vehiclce. Whether they are BS or not, we must have a group of car enthusiastic who are brave enough to try it.
I would get it just to change the Rev Limiter or whatever it is , if it could do that.. Because the GS430 is just shy of the redline no matter how hard or when u step on the gas, the only way it'll get there is if u Gate shift.