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I installed a JB4 tuner from BurgerTuning, what a difference! I bought the main unit, plus the Bluetooth kit. Around $700 total. Installs in about 30 mins. Biggest amount of time is routing the OBD2 connector to the port under the dashboard. Getting the cable through the rubber grommet was hell. But that said! The JB4 app allows you to control a number of parameters, including setting the Map you want. Map1 is standard, 91+ octane 4psi additional boost. Map2 is 91+ octane 5 psi additional boost, and Map3 is 93 + or 30% E85 mixtures with 5.5 plus boost. Up to 100 additional hp. The unit works with the factory DME tuning. Easily removed if need be. No flashing. All I can say is that it really makes a difference! Only bad thing is that I can’t get to the passenger side fuel sensor connector to hook up the optional monitor. Says it can squeeze out more ponies that way, oh well.