my 95 gsr with i/h/e has been tapping for awhile now. i just got it back from a valve adjustment today, but it still taps. i dont think its the valvetrain, but im not sure. tech said it's normal, but the tapping is pronounced more because of the header. its a dc 4-1 ss header... has anyone else had this problem? if so, what could the tapping be coming from, and is it normal?? any advice/info. would be great.