This is what i have, i run 94 oct gas 17# boost and when i roll into the throttle or at wot my casper knock guage goes red why is this? And konw i cant tell if i have an header leak on driverside or a lifter sticking. I dont have a scantool yet but working on getting one. I went to gntype.org to see the specs on the o2s and everything else can i check these with a volt meter? 
