It can't hurt to try. Basemap on the P75 is probably going to be pretty damn close to what you would want and would eliminate the secondary O2 codes.
I am running damn near prefect on a stock PR4. Passed emissions way better than with the obd0 PJ0, power and fuel milage were improved as well. I'm getting 30-32 city and 38-41 highway. P75 should be a bit richer than the PR4, probably perfect for the B20A.
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