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I have also mad scientist the JB4, TDI, both vs stock factory.
And currently JB4 removed after a year because stock tune is best and smooth and fastest once going.
TDI sold because lack of logging and lack of failsafe but I do say still was smoother in RPM get up and go due to the RPM sensor tap. Customer service was excellent as well!
Pedal tuner a must though in all situations.
I added AEM gauge tapped directly for monitoring boost as well for experiments and my statements above are reflected with proof in doing so.
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