It is possible. Not as often as you think it could be. We always built a tennis ball set up with a chain attachment to it so it could easily be installed or removed at the track on short style Zoomies. The Funny Car had insulated pipes so it wasn't a threat to our valves. How big is the inside pipng on your exhaust? Yes, cool air can hit the "Tulip" and cause a slight bend, just not as often as most people think because of rapid heat tranference and good metal technology in the valves themselves.