@justgary Does Marine Torq make manifolds with cats? I have no idea, i just figured you would be the guy with some knowledge on this.

I wonder if there is some kind of or any alternative? 

2 hours ago, Ovaltine said:

Looks clean but it’s not an LXI

That is correct. Probably why it hasn't sold yet.

Gas is terrible these days.  Mine had a very slight hesitation first run this year (never has in the past).  My local shop is now advising to keep tanks as empty as possible over the winter (rather than full).  I have a new fuel filter to go on once I burn through this tank from last season, also doing plugs, cap and rotor for good measure.

Ugh, I’m dealing with this same issue. Was told have to replace both cat/manifolds. O2 sensors were completely black and they put a scope in the manifold and the brick on the catalyst is completely not existent and sludge in the manifolds. 
My mechanic used to work for Malibu then branched out on his own so nice to have that solid knowledge but jeeze. Talk about having to sell a kidney for this repair! $6400. Guess the newer years have separate cats from the manifold but my guy said still the older Malibus are some of the best built and guess these are things that are typically replaced around the 12-15 year mark(my boat is a 2010).