You need to get rid of the SAI to stop the popping on decel. You can go about it many ways but the easiest is just a piece of duct tape over the port in the airbox. Or you can put a marble in the hose or go whole hog and make 3 block of plates and remove all the other SAI hardware. All equally effective. The only way it will pop after that is if you have leaks in the exhaust.