Exactly, the jumper mod deals with the ECU and has nothing to do with your exhaust servo.....The jumper mod is beneficial no matter what other mods you have, i could tell a big difference in high rpm's (don't forget to reset the ecu, by taking the battery terminals off for a couple secs)The Jumper Mod, as I have learned, has nothing to do with the butterfly valve. It is controlled by the ECU..
On my 06 ZX6R, at around 12-13K, my bike pulls harder.
I have a full exhaust system also. No exhaust valve. I felt a difference
did u gain any power with your s/o alone? can you tell the difference? you should have and must have the jumper mod as it does kicks in some horses at higher rpm.I recently put the Jardine slip on; on my '08 zx6R. It is beneficial to still do the jumper mod, even though the butterfly valve has been removed....? I really didn't think so, but I read other guys mods and allot of them have the mod done with exhaust.