I am getting ready to gut the two precats on 5.5 gen, and i remember seeing this screen, the question is does anything need to be kept entact on the inside of the precats when gutting??? Or just have at it and try to not damage the inside walls too much?? i may do this tonight so a promtp reply would be great !

 

Go crazy and clean out the entire insides.

 

That is the cat....

 

all done!



rear is harder material, more dense, be more patient, 25-30 mins time, front (90 deg elbow) is easy 5 - 10 mins time.

16" spade bit for wood is what i used, and i recommend corded drill, because it would prolly eat at least 3-4 batteries on cordless drill

tools - drill, 16" long x 1" wide spade bit, and chisel, and hammer and vice grip or something for securing the pieces while doing the work,

 

You need to install 02 nonfouler to the two secondary 02 sensor (one with white wire and one with red wire ) Precat near the radiator need a new steel O ring (connection between y pipe and precat). The connection between precat and exhaust manifold, does not need a gasket just follow the recommended torque. Precat near the firewall needs O ring on both ends.

 

thanks colt45 !! i have a dual output sim, going to wire tonight before i install the precats. and thanks for heads up on the 3 metal o-rings!

i am taking to a shop with the newly wired sim, and having them throw in the "precats" (gutted) , i literally will have entire new exhaust from precat to muffler.

anyone looking for howto on sim install here
https://maxima.org/forums/5th-genera...tallation.html

 

Good to see you finally got it done
How did the pre-cats look before you started chopping away? Any sign of the impending disintegration?

 

i bought them used from a org member, so i can throw them at a shop to install this week, being a daily, i couldnt do it myself, and then take up another night or day etc to gut them while the car waited. this way i keep driving, minimal down time. i am definately keeping my old ones, and we will see then !

 

he bought them from me. they were actually not disintegrating at all considering that i had 170k on them. but they were pretty plugged up. car feels great with headers on. although a bit louder

 

yea they had nothing wrong with them, i have 182k so i hope I am the same. and what do ya mean by plugged up? ?

 

probably from oil burning

 

OP going to get cancer now

 

This actually lowers my paranoia a bit.
My car has 85k, debating of which to do.
The Pain in the a** OBX headers or just gutting out the cats.

 

just replace the entire thing
The cat has platinum in it so I suggest taking it to Nissan and giving it up.
​​​​

 

what r u talking about? no dealership will do illegal activities on the books

 

Well that's the thing I doubt they'll gut it for you.
How much is the platinum worth?

 

Old cats aren't worth much. Just a few bucks each if you sell them to a recycler. Sure there's platinum but it's not like it's filled with coins. It's a small amount and it has to be extracted.

 

It could be I'm just not patient enough, but my rear pre-cat is HARD. Spade bit wouldn't touch it so I resorted to my biggest drill bit. Hammer/chisel no use either. Now I've just got a bunch of holes (which don't go all the way through) It's a mess. Anybody have suggestions for gutting stubborn rear pre-cats?

 

Got it figured! I used an Irwin Speedbor type of bit. The self-centering/feeding of it made it work far better than an ordinary HSS drill bit. Then I used hammer and chisel on the thin "veins" and eventually (patience) I got it all out. That material is rather impressive; too bad it robs power.

 

Hope you stopped to buy a good respirator!
That has some nasty stuff in it
Rhodium, platinum, zirconium ceramic.
I'd say it's about as bad as asbestos.

 

All three are about as neutral as you can get and the total cost of the "stuff" is about $150 when recycled. Rhodium is $800 an ounce.

 

I have gutted cats FS if anyone needs #shamelessplug