I have an exhaust leak at the manifolds and I just can't get rid of it. I tried 4 different gaskets and no luck. I even tried doubling up and it was the best i've gotten it so far. In my last attempt, I made sure to scrape off all the old gasket(s) and use a fresh set of lock washers. Now it leaks even worse. I think maybe my manifolds aren't straight? Or should I try tripling up on gaskets? I've been told that you can get away with no gaskets with manifolds. What can I do?