Exhaust Manifold Gasket Replacement
 

There's a ticking noise coming from my 99 2.5 Boxster. You can't hear the ticking whilst idling or when the Windows and roof are closed. But when the window is down it bounces back and can be heard on acceleration up to about 40 mph.
I believe it could be the exhaust manifold gasket leaking ???. My question is how easy is it to remove the exhaust manifold to replace the manifold ??? Your thoughts would be appreciated guys ??

I would make sure the clamps between the cats and the C pipe aren't leaking first. The manifold bolts have been known to snap off in the block. So I would check the other components before messing with the manifold bolts.