no 15 minute rule, the factory 02 is out of the circuit, did you calibrate the throttle position sensor?
Use the map I emailed you. Use the 2 and 3 degree timing table, it will run hotter advanced, not a bad thing, make sure you use 93 octane
A slip-on will not do much unless you cut the air box, letting it breath out requires letting it breath in....
Make sure the POT under the seat is set at #2