TechT and Lapco are good kits, and I have used them on past A5's, should not be something you need to get the cyclone working correctly though. Are all your fittings on your 98 new, are the small hoses to the fittings in good shape? Have you had the cyclone apart at all, sometimes the o-ring on the actuator shaft gets put back on backwards... Check that your fittings on the aluminum housing are snug as well...if you are shooting at field velocity, the cyclone should work properly, do you know what fps you are shooting? If your velocity is too high it can cause issues...many little things to check.