I dont really think people should recommend turning up boost without any way to monitor things. Just in terms of reliability and safety its not really a great idea. Thats why people have so many issues with products like racechips.The JB+ is fine (I have one and turned up the gain on it) , but it wont get you logging, more power, etc like the full blown JB4 unit will.
I bought one because it was something to tide me over until I could get a full tuning solution.
In regards your original question - I have used used ODB Fusion and Torque to clear emission codes on other cars with no issues, but not the Supra.
When will the code come back? Probably in a couple of days.
The other problem you will have is passing emissions testing if you have them in your province. When you clear the code, it puts your emissions tests in the ECU back in "not ready / learn mode" until you pass a certain amount of time driving, RPM changes, etc. During this time you will not be able to pass emissions.
What will happen when you meet all the requirements to pass the test in your ECU, is that it will set a check engine light and you are right back at square one.
If you want a catless downpipe on any car, you have two choices 1) A computer tune that removes the rear 02 sensor checks, or 2) some type of simulators/extenders that either modify voltage from the rear 02 sensors or extends the rear 02 sensors away from the downpipe.
On newer cars the simulators do not work that well, if at all. Your true solution is a full computer tune that deletes these rear 02 codes.
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