Question about our cats..Not another "if i remove it blah blah blah threads."

[brisknfade]

My transmission died on me, and while removing it tonight, i took apart the exuast system to get some cleareance to remove the transmission. Well i took apart my cat, and i looked inside and saw this-

So my question is, has this thing been gutted out? I thought catalytic convertors had a honeycomp looking structure inside, or at least all the ones ive seen had that. Or is this simply the resonator?

And another quick question, how much does a manual transmission for a KA24DE usually go for. I guess something broke off the throwout bearing and was eating up the splines on the main shaft going into the transmission Oh well.

[lrb_2000]

well it's obviously gutted, or some sort of high flow cat? ... I gutted mine, and it looks like that now. The honeycomb is pretty hard stuff.

i wouldn't pay more than $250 for a transmission.. that's only if it had really low miles on it.. so probably around $150

[97ka-t]

I've seen low mileage ones sell for $400+. But yeah, $250ish woudl be a fair price for double digits I guess.

[Ligouri Rd]

Ah, the olde where's my cat issue with S14'sFirst of all, I m willing to bet that you have a '95 S14...caint tell from the pic since it is too dark to see your grill.If that is the case, then that is not your primary catalytic converter it is just a "resonator". If you take a look at the downpipe, there is a pretty large bulge right after it connects to the header. That is where the cat is. I guess on S14's they moved the cat further forward to get it to light off quicker after startup. Also on '96 and up S14s that "resonator" is not hollow, there is a primary and a secondary cat.

[brisknfade]

Yup that would explain it then. It is a 95'. So then i guess i could remove this resonator and just put a so called test pipe there with no ill effects and not have to worry about emission stuff for the most part. I was so sure that was the cat, looks like one from the outside and "Calsonic Nissan" is even stamped onto it.

[98s14inaz]

Ah, the olde where's my cat issue with S14'sFirst of all, I m willing to bet that you have a '95 S14...caint tell from the pic since it is too dark to see your grill.If that is the case, then that is not your primary catalytic converter it is just a "resonator". If you take a look at the downpipe, there is a pretty large bulge right after it connects to the header. That is where the cat is. I guess on S14's they moved the cat further forward to get it to light off quicker after startup. Also on '96 and up S14s that "resonator" is not hollow, there is a primary and a secondary cat.

Negatory. That might be a cali car only thing...double catting that is. My 97-98 had the primary close to the engine and the secondary was fake/empty (16k miles so don't tell me it burned out). When I got my 95 I discovered that it was exactly the same except the 95 used a smaller o2 sensor.

Easy way around it is to replace the fake cat with a 3" cat and move the o2 sensor bung behind it. Lengthen the #2 o2 senor wires and you are done. Now you will be able to use headers or straight through turbo downpipes with out throwing codes.

[Ramius83]

Now when I removed my stock exhaust system from my 95 240sx SE, I had a primary and a secondary cat. Both cats had the honeycomb structure in tact. As a matter of fact, with the RB26 on the car and the old 2.25"-2.5" stock cat on there, I still passed exhaust emmissions. Go figure......

[1998S14]

I thought it had to do with states issues, my 1998 had a hollow second cat when I put test pipe in at like 45K miles, Now with my hotshot I am having to add a high flow where my test pipe is like stated above, Blasted MD emmissions

[98s14inaz]

Weird, it doesn't seem like they were very consistant with the equipment. You'd think they would have done it on all of them.

[ddgsxr504]

I have a 95 and my "secondary" was hollow as well, just did like brisknfadesaid and put a test pipe on their that I got off ebay for like $35. Makes the car A LOT louder but much meaner sounding. Not for faint of heart or those wishing to avoid noise ordinace at WOT!

[Ligouri Rd]

Yeah, clearly nissan is not consistent with parts. I have heard that halfway through the 95 year they started putting more emissions crap on the 240s, that might explain why some '95s had two cats. That doesn't explain how a few '97 and '98s do not have a secondary cat. My '96 had two cats, and it was origonally sold from a dealership here in Illimois.

I guess that the only truely accurate thing to say is that the thing that looks like a cat might actually contain catalytic material.