Are these catalitic converters or resonators? Or Both? The stock bends look nice. The "Y" pipe could use some help.

http://img.photobucket.com/albums/v315/Gearjamer/DSCN3213.jpg

http://img.photobucket.com/albums/v315/Gearjamer/DSCN3212.jpg

I think it depends on what you have a 4x4 or 4x2. I think I read the 4x4's have 2 sets of cats and the 4x2's have cats and resonators. I am probably wrong or have it backwards but its something like that.
M4ck

I believe it's 4x4, that looks like the front drive shaft in one of the pics. Those are cat. converters.

Are these catalitic converters or resonators? Or Both? The stock bends look nice. The "Y" pipe could use some help.

http://img.photobucket.com/albums/v315/Gearjamer/DSCN3213.jpg

http://img.photobucket.com/albums/v315/Gearjamer/DSCN3212.jpg

You have a 4x4 and those are cats. If you had a 4x2, you would have resos that look like 8" long mufflers.

Here's what the resonators look like on the 2WD.
On the right side of the truck you can see the O2 sensor
connecting to the pipe just in front of the reso.

http://www.clubtitan.org/modules/coppermine/albums/userpics/10122/clubtitan-8.jpg

It's a 4x4 with the offroad package. Now I'm bummed. I've read that the best gains are had by removing the resonators. Since I have cats there I don't know about removing them. Has anyone tried this? Why do 4x4's have 4 cats and 4x2 only 2?

Thanks for the replys,
Bill

Jettech has removed his and loves it.
M4ck

It's a 4x4 with the offroad package. Now I'm bummed. I've read that the best gains are had by removing the resonators. Since I have cats there I don't know about removing them. Has anyone tried this? Why do 4x4's have 4 cats and 4x2 only 2?

Thanks for the replys,
Bill

Yes I've removed the cats from mine and no I don't have any idea why the 4x2 and 4x4's come with 2 different setups. Seems kind of screwy to me but then again I don't remember Nissan calling me and asking me for advice on this one... :lol:

Wow!! Those exhausts are clean. When I took mine off, they didn't look nearly as clean as those.

Wow!! Those exhausts are clean. When I took mine off, they didn't look nearly as clean as those.

The truck only has 2150 miles on it. Now it's got the brake shake. I'll start another thread in General on that one.

In CA no one will touch your cats! In the past you could slip the installer an incentive...not any more! They crack down on that sort of stuff over here. I'm glad I have the resonators because I'm getting mine done Thursday.

My theory on why 4X4's have 4 Cats and 4X2's have only 2 is predicated on the assumption that with 4 Cats you will emit less harmful emissions. With that said, it can be assumed that 4X4's will venture off road in rural areas etc. In an attempt to add less polution to these areas 4X4's where equipped with 4 Cats. Just a theory.

In CA no one will touch your cats! In the past you could slip the installer an incentive...not any more! They crack down on that sort of stuff over here. I'm glad I have the resonators because I'm getting mine done Thursday.

I'm finding out it's the same here in CO. I knew the shops wouldn't simply replace the cats with a straight section, due to EPA regs, but today I found out they can get in big trouble for making up straight sections w/ flanges. They'll make you the sections w/o flanges, but that does me no good as I have way of flaring the ends on 2.5" pipe. I'm gonna try another shop that's done a lot of work for me with my last two trucks....maybe a :wink: and an extra $20 might do it! Any ideas, guys and gals??

Money usually talks... :bling: I'm sure they will accomodate your request... :wink:

Problem with shops doing illegal mods on street vehicles is that the laws are written to go after them too, not just the vehicle owner. Shops can get shut down in addition to fines. I'll bet if one shop gets wind that a competitor is doing illegal mods they wouldn't hesitate to sell them out to the authorities.

Problem with shops doing illegal mods on street vehicles is that the laws are written to go after them too, not just the vehicle owner. Shops can get shut down in addition to fines. I'll bet if one shop gets wind that a competitor is doing illegal mods they wouldn't hesitate to sell them out to the authorities.

Excellent point! That's why it's so hard to find a shop to fudge smog tests these days. Sure the info goes straight to the State via EDI but even when the dyno type systems were first introduced in California I knew of several shops that kept a really clean burning compact car hanging around they could strap to the rollers for you for a few hundred bucks. When the legit shops caught wind, the State cracked down. I never entertained these types of illegal activities :bling: but I have a friend who has a very fast 1991 5.0 Mustang that has been modified past the point of no return and has had to go "Non-Op" on it for the second year in a row because he can't find anyone to smog it.

Problem with shops doing illegal mods on street vehicles is that the laws are written to go after them too, not just the vehicle owner. Shops can get shut down in addition to fines. I'll bet if one shop gets wind that a competitor is doing illegal mods they wouldn't hesitate to sell them out to the authorities.

I'm sure you're 100% right about that. I think a shop can get fined up to $10,000 for getting caught doing this stuff. That's the same fine that applies to an HVAC contractor getting caught releasing CFC refrigerants into the atmosphere. When this was first implemented by the EPA, there were stories of guys on rooftops w/ video cams trying to catch their competition in the act to collect!

But one guy told me "as long as you don't tell me what it's for, then...."..lol! If both sections were straight w/ no bends, I could just give them the measurements...no problem. But I'll at least have to remove the cat sections and bring it to the shop so they can match it up for fabbing. That's when I'll probably run into trouble, as most shops will know that those are cats, and not reso's! They are rather funky looking cats, so maybe I'll be able to convince someone that they are indeed reso's.......yeah, right.

i guess one way to get around that would be to leave the 2nd set of cats in place and just knock out the cat material inside of it :lol: . that way when they look at it, it still looks stock and it was free to do also :roll:

Clean power is the way to go! :D :D :D In California, that is!

Problem with shops doing illegal mods on street vehicles is that the laws are written to go after them too, not just the vehicle owner. Shops can get shut down in addition to fines. I'll bet if one shop gets wind that a competitor is doing illegal mods they wouldn't hesitate to sell them out to the authorities.

Speaking of this, I took my Scout into a Midas to get duals run on it and they wouldn't even touch it because it didn't have CATS. I explained to the guy that it's a 76 and its classified as a 3/4 ton so it's not required to have CATS and it didn't have cats when it rolled out of the factory but they still wouldn't touch it. I think this guy was just being a little bit over-anal about it, especially considering I live in Kansas and there is no emission testing at all required on anything.

i guess one way to get around that would be to leave the 2nd set of cats in place and just knock out the cat material inside of it :lol: . that way when they look at it, it still looks stock and it was free to do also :roll:

That's a good idea. I may have to look at that option if the 'wink' and a twenty spot doesn't do the trick!

here in michigan we dont have any emissions testing either. the muffler stores here will put a strait pipe in place of your cat, as long as you cut out the cat and not them. thats what i did on my gran prix.

i guess one way to get around that would be to leave the 2nd set of cats in place and just knock out the cat material inside of it :lol: . that way when they look at it, it still looks stock and it was free to do also :roll:

That's a good idea. I may have to look at that option if the 'wink' and a twenty spot doesn't do the trick!

I don't think the cats are that restricitve. I believe the piping size and inlet/outlets are the problems here. I could be wrong, I wouldn't know for sure unless I looked at it.

Clean power is the way to go! :D :D :D In California, that is!

I agree, but the 4X4 running the two primary cats should burn just as clean as the 4X2. I'm half tempted to hook up my combustion analyzer before and after these secondary cats just to confirm that they indeed are cats!

A few ideas...
1. Go to another state to get this done.
2. Have a friend in another state have this done for you.
3. Do this yourself.
4. Have a friend who can work piping and weld do this for you.

Clean power is the way to go! :D :D :D In California, that is!

I agree, but the 4X4 running the two primary cats should burn just as clean as the 4X2. I'm half tempted to hook up my combustion analyzer before and after these secondary cats just to confirm that they indeed are cats!

Yes, it should. I'm still baffled as to why they use 4 cats on the 4x4. The only thing I can think of is there is more drag on the drivetrain/engine so it runs a little dirtier.

A few ideas...
1. Go to another state to get this done.
2. Have a friend in another state have this done for you.
3. Do this yourself.
4. Have a friend who can work piping and weld do this for you.

or...

5. Convince JT :hypnotiz: that he must sell me his straight pipes and have another set fabbed for himself. :thumbsup:

A few ideas...
1. Go to another state to get this done.
2. Have a friend in another state have this done for you.
3. Do this yourself.
4. Have a friend who can work piping and weld do this for you.

or...

5. Convince JT :hypnotiz: that he must sell me his straight pipes and have another set fabbed for himself. :thumbsup:


since there attaached to his headers, i dought hes going to want to go to the hell and back again to change those headers :lol:

Clean power is the way to go! :D :D :D In California, that is!

I agree, but the 4X4 running the two primary cats should burn just as clean as the 4X2. I'm half tempted to hook up my combustion analyzer before and after these secondary cats just to confirm that they indeed are cats!

Yes, it should. I'm still baffled as to why they use 4 cats on the 4x4. The only thing I can think of is there is more drag on the drivetrain/engine so it runs a little dirtier.


I wonder if they used 4 cats to reduce the heat in each one. After all , a 4x 4 might be assumed to be operating off-road and they are attempting to reduce the fire hazard from the very hot cat-converters in an area where grass or forest fires might be started accidently?

Heres something else to add to the confusion. All Armadas, 2X2 and 4X4 have 4 cats.