Yesterday I was taking a look at my engine as it was warming up and noticed a very small amount of smoke or exhaust coming from under the port side exhaust manifold? I recently had the compression tested and serviced and new plugs installed, so the boat is running pretty well. The engine is a stock 502mpi with corsa silent choice exhast and low hours on the motor. I am wondering if there may be a small crack in the manifold? If there is a crack and I need to replace the manifolds, what would you recommend for a replacement? Since it is a stock motor, should I just replace with stock manifolds? Or would it be worth it to get some nicer headers or some EMI manifolds? At this time, I don't really plan nor do I have the cash to throw a ton of money into the motor. But if I can get some extra noticable power out of nice manifolds I would consider. Anyways, I would appreciate your thoughts on this. Like I said, it was a very small amount of smoke. Hardly noticable unless your face is right on top of the manifold.