So we tuned this 16vt on 034 (we didn't do the install). The customer raced a few S4's on the way back (killed 'em), and said the boots for 1 and 4 spark plugs popped out twice pushing them up so the cylinders lost spark. He pulled over and pushed them back in and it then happened a second time 10 min. later... He said the boots were INFLATED like balloons, and when he pulled them up air rushed out, and theN they went back to their normal size...lol I guess either the valve cover gasket or leaking past the plugs would cause this pressure buildup, but I have nevar heard of this??