Would you change your cat?
05-11-2011, 05:18 AM
#3
thanks man, this thread was actually meant to be a a poll.
Would you change your cat(s) if you had no codes associated with the cat(s), but smelled the "rotten eggs" after at spirited accelerations, and not typically around town and normal conditions.
Would you change your cat(s) if you had no codes associated with the cat(s), but smelled the "rotten eggs" after at spirited accelerations, and not typically around town and normal conditions.
05-11-2011, 06:11 AM
#5
I would change it since Cattman's fast cat is relatively cheap vs OEM. And it's design is really good for flow, from its shape to it's diameter.
Mine even gives a slight rotten egg smell (sulfur) when I get on it every now and then, not bad but noticeable.
Mine even gives a slight rotten egg smell (sulfur) when I get on it every now and then, not bad but noticeable.
05-11-2011, 06:31 AM
#6
Then add a poll.
I would, yes.
Junk in the pre-cats... isn't that the primary cause of the 1500-2000 rev "bees-in-the-can" syndrome? I've had that noise for about a year now. Very disconcerting. No cel, no smell, and no (perceivable) power loss, just bees in a can.
Junk in the pre-cats... isn't that the primary cause of the 1500-2000 rev "bees-in-the-can" syndrome? I've had that noise for about a year now. Very disconcerting. No cel, no smell, and no (perceivable) power loss, just bees in a can.
05-11-2011, 10:59 AM
#7
Thanks for the reply,
05-11-2011, 11:26 AM
#9
What O2 sensor crap? There is no O2 sensor behind the main cat on 02+ models. Also, it's a real converter, not a BS resonated straight pipe like the Megan type.
05-11-2011, 11:28 AM
#10
NMex's comment is referring to the debated "pre-cat dissolves backwards into your engine and you lose it forever so sad bye bye" issue, which he comes down on both sides, depending on the relative humidity of New Mexico's steppes.
I can smell a gas-y smell after romping on mine, but I've never smelled sulfur from any part of the exhaust system. Trace exhaust leak causing the gasoline smell, mayhaps?
05-11-2011, 11:45 AM
#11
Hmmm... SOMEONE (psst: that's you) haven't been reading all the dramatic pre-cat threads that have been cropping up like maggots in rotten meat. The (non-specific, generic) pre-cat has that honey-combed piece of metal in it that the substrate dwells on. The metal ages and begins to flop around, hence your bees in a can sound. Apt name, given the internal structure. I can't remember the exact shape and stuff of the Maxima pre-cat internal, but it does the same thing. In the worst case scenario, that metal works itself loose, or enough of the substrate loose, and gets sucked into your main cat, which promptly plugs up and stops your engine from running 'cause the exhaust gas can no longer leave the cylinders. Oops. Child of Korn will readily describe his cat-clogging experience, if you want to get dramatic about it.
Aw, crap. I need to start reading up on this in a more focused manner. For the last year or so, I've been just randomly paying attention to it and ruling out things like gas, timing, pinging, etc.Thank you, Eirik. So we don't throw Prophecy's thread OT, please PM me if you have links and info handy on resolving the bees-in-a-can with my '03 (Cattman Y-pipe, OEM cat, Cattman cat-back).
Or post it up here if you think the OP would benefit. Either way.
Hmm... each pre-cat on the 2003 lists for $625 at Courtsy Parts.
That's nuts.
Last edited by Rochester; 05-11-2011 at 11:55 AM.
05-11-2011, 12:23 PM
#14
There is a guy at my dads work who is replacing a motor in a 02 maxima cause the pre-cat went bad and sucked that shti back into the motor and killed it.... Im throwing a P0430 code so im trying to figure out if its an O2 or cat.... >:-(
05-11-2011, 12:26 PM
#15
This was not on my mind when I got in the car today.
05-11-2011, 02:51 PM
#17
05-11-2011, 02:54 PM
#18
05-11-2011, 03:09 PM
#19
Here's the diagram of OEM config from CourtesyParts that I'm sure most 5.5 gen owners have seen a bazillion times:
Last edited by Rochester; 05-11-2011 at 03:14 PM.
05-11-2011, 03:26 PM
#20
I'm not sure how to take being mentioned LOL. No dramatization there. It ruined the engine and clogged the main cat. Gut them or get headers and test pipe. F cats. I'd saw the pos off at the dealer if i ever bought a car new 
Op: I'd replace it with a fast cat or just hollow it. It's a very unnecessary part and then you won't smell light rotten eggs.
Op: I'd replace it with a fast cat or just hollow it. It's a very unnecessary part and then you won't smell light rotten eggs.
05-11-2011, 05:08 PM
#21
No. The 5.5 gen Cattman-Y is a direct y-pipe replacement, bolting to the two pre-cats that hang off the exhaust manifold, and then to the main cat in the rear. It's an upgrade over stock because of the clean bends and the uneven length collectors. Headers use the space of the deleted pre-cats for the extended collectors, one for each port (duh, right?) The lack of pre-cats is why most of the time people need an O2 simulator. That's been my understanding of the tech all along... someone feel free to correct me if I'm off-base.
Here's the diagram of OEM config from CourtesyParts that I'm sure most 5.5 gen owners have seen a bazillion times:
Here's the diagram of OEM config from CourtesyParts that I'm sure most 5.5 gen owners have seen a bazillion times:
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