Ditto. FWLIW, I think you guys are on the right track. mlp ~-----Original Message----- ~From: s-car-list-admin at audifans.com .... snips .... ~ ~From my research, typical temp drop using IC spray is 15 degrees ~F, and in intake system is 75 degrees F. Seems like a no-brainer to me. ~ ~Bruce ~'93 S4 ~