ok guys just put CFR slip on`s and v&h dresser daul head pipe on a friends 2011 road king, it has stock ac and nothing done to the motor, love the look and sound very deep, now the problem, it seems to stumble when he rolls on the throttle, runs great from take off and if he keeps on it, but when going 1/4 throttle to full throttle doesn`t go anywhere then jerks for about 3 sec. then takes off. I am thinking it might need a turner thinking a pc v, but not sure since it only has exhaust done and no ac.
PLEASE help
Thanks Jeff

 

I felt something similar to that before I got the V+H Throttlepak. I was sceptical at first, but it makes a big difference in throttle response. It won't go away with an AC and tuner alone.

 

I have CFR's on V&H power duals tuned with a SERT. You will need to get a good dyno tech to get the low rpm air fuel mixture and spark advance just right. It took three dyno runs over a week to get dialed in just right for me.