Are they reusable? When I dropped the exhaust on my Camry to do the oil pan, I just reused it. I've had some sort of engine smell for about the two years I've had the car, and I'm still tracking down what it could be, and this seems like a cheapo thing to try ($6 at Autozone) but I'm wondering if I should have replaced it when I did the oil pan gasket. [The downpipe was slightly in the way, so it had to be unbolted from the manifold.]