Joey I have done both mods and though they did improve throttle responce they did not alleviate this problem. I am in the midst of experimenting with the spring on my TurboXS H34 Mondo BPV. I also have in my possesion a diaphram BPV from a Mitsu EVO. I'm working on a suggestion from Trevor Frank. Hap, fiddlin in Everboost, Maguire