Those years don't jive together....and there is a difference between 600 and 750. What year is your bike? These are the model years of the bikes that share the same ecu. 06-07 GSXR 600 06-07 GSXR 750 08-09 GSXR 600 08-09 GSXR 750
So you need 2 ecu's? One for a 600 and one for a 750? The 600 and 750 ecu's are different. The main difference is the redline in the RPM's. 600 is higher than the 750. 06 GSXR 600 - https://www.motosport.com/oem-parts...urce=suzuki;gsxr600;2006&partgroup=electrical 06 GSXR 750 - https://www.motosport.com/oem-parts...urce=suzuki;gsxr750;2006&partgroup=electrical
They are different 600 vs 750 ECU wise. And they are not interchangable any of those years 06-09. Now 0607 use the same harnesses as well as 08-09. But the ECU's are all different and will not work unless you get the correct one. And Edit: my ECU sold. Good luck
08-09 600/750 has the A,B,C mode selector and also has the electronic damper. Hence the major differences in the 06/07 600/750 vs 08/09 600/750. Don't give up OP...I have some ecu's but not sure what you need.