I Have also heard that if you plan on getting a low pressure kit, stay with a QEV, but if you would like to leave it at normal pressure, get the QEPH. I personally have the vortex, and I thought the install was not that hard, also, I have shot several cases thru it and havent broken a ball with my APE board set to 25bps. Hope that helps. (I also have a lighter spring, and the lightning rod, and a palmers QEV).

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Man... I didnt even see you coming