H Pipe Leak Question..

The passenger side of my H pipe is leaking at the exhaust manifold, I know there is a gasket in there, does anyone make an aftermarket one that is better than stock? The ticking noise sitting at idle with the windows open is driving me nuts! Luckily I can't here it with the windows up. One more question, everyone seems to love the mac prochamber, do they come with cat's?

Thanks

How do the catted prochamber's sound? Anyone have one with magnapacks? How much does a new gasket run??