i tried swapping ecu's in my 01 gsr, and unfortunately i didnt get it to work...so i went back with the obd2 ecu, and before that i also was driving around with my stock airbox off for fun...then i put the air box back on..bout 5 minutes later, i turned on the car to see the check engine light on...

 

so check it ?

 

http://www.c-speedracing.com/faq/06.php