Well I have a 08 1600 nomad.
My bike has no aftermarket parts as to exhaust or air intake.
When i put the cobra efi on I notice that the bike when decelerating would hang just a little bit around 2000 rpm causing me to brake a little harder then I was comfortable with.
But since taking it off I notice that my bike would run irractic as far as throttle.
Well anyway to make a long story short I install the resister fix (http://www.gadgetjq.com/ping_fix.htm
In the process of doing this mod I inadvertent let two rubber hoses to the air intake loose and they came off.
I believe this is where my problem was and not the cobra efi.
I do not have it any more to try it but I will say one thing my 3 and 4th gear had all sorts of pull and acceleration.
Kinda miss it but after doing the above resistor mod I am it seems achieving the same thing.
I would suggest reading my thread I had going (https://www.vulcanforums.com/forums/s...ad.php?t=22641
) to read what I learn from another gentleman.
In the end I am staying with the mod especially in light of the mistake in the hoses.
Everthing is running normal now and I change the values of the resistor as mention in the thread I mention below.
I hope this answer your question if not you are more and welcome to email me.
Regards and safe travels.