Yep, Your gonna have to do it. At full throttle the change prolly won't make a big difference, but at low throttle settings in the 3,000 to 4,000 rpm range you will likely have to make big changes to improve drivability. Always try to richen it first to be on the safe side. I had to richen mine up quite a bit from 2%-10% throttle to get the throttle response back to near stock.