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-   -   OEM or replacement cat converter question (http://www.infamousnissan.com/forum/showthread.php?t=38261)

ahardb0dy 09-26-2016 04:23 PM

OEM or replacement cat converter question
 
I was talking to Delvin about the exhaust system and pipe sizes etc. He said the pipe size reduces coming out of the cat from 2" to 1.75". You can obviously see the pipe at the output flange is smaller,

My question is, has anyone seen or measured the actual output size of the OEM cat converter or a replacement direct fit (with flanges) cat converter?

I will be ordering a new direct fit cat this Friday and the Walker part from Rockauto looks like the in and out are the same size.

Going to e-mail Walker to see if they can give me the specs on the cat as they are not listed on the website.

If the output is the same as the input (2" or larger) I will try to have a 2" pipe attached to a flange I have laying around. I want to keep all the pipe the same size. 2". The muffler I will be using is a SS Borla 2", and I plan on ordering the Walker mandrel bent 2" tailpipe.

Thanks

Midnight Tech 09-26-2016 05:10 PM

What's the part #, ahardb0dy?

ahardb0dy 09-26-2016 05:18 PM

Walker 15538, just e-mailed them

Midnight Tech 09-26-2016 05:34 PM

Ah ok - was thinking of the earlier model version. Forgot the later model had flanges on both ends.

ahardb0dy 09-26-2016 09:47 PM

They just wrote back and said the pipe ID is 2.52", so that means the pipe coming out can be what ever size flange (with pipe) I use, which will be 2".

I pulled 2 flanges I had from my 90 sentra and they both came from the same car and one is 1.5" pipe and the other is 1.75", but the flanges are both the same size, and I know the cat on that car had larger openings.

so one good thing anyway.

If I can't get this engine to idle right I won't be replacing any exhaust, may just be beating it to death with a sledge hammer !

swampyankee 09-26-2016 11:24 PM

Quote:

Originally Posted by ahardb0dy (Post 464819)
Walker 15538, just e-mailed them

I installed the same Cat on my 94 XE.
Easy swap and works fine.

But I was disappointed when the welds on the Heat shield failed after about 15 months of daily driving.
Noisy and annoying as all hell.

Had to drill and drive some tek screws into it.
I guess, check the welds.

Just a heads up

ahardb0dy 09-27-2016 01:35 AM

Thanks, they have a $50 visa card rebate on it right now

cadillacdude1975 09-27-2016 01:48 AM

i recently had an issue with the lexus.......OEM cats were 300 each. screw that.......i had a mom and pop shop cut the exhaust resonator out and install a universal cat. worked like a champ to pass emissions.

ahardb0dy 09-27-2016 01:57 AM

I know the universal ones are cheaper but i want to keep the flanges (for now). The one I posted the number for will cost $103 with the shipping, minus the $50, so $53

cadillacdude1975 09-27-2016 03:08 AM

cant beat that. the good thing is if you can get the bolts loose, its something you can change at home.

swampyankee 09-27-2016 04:18 AM

Quote:

Originally Posted by ahardb0dy (Post 464862)
I know the universal ones are cheaper but i want to keep the flanges (for now). The one I posted the number for will cost $103 with the shipping, minus the $50, so $53


Find the local guy that buys used cats.
I got $25.00 for my old one.

ahardb0dy 09-27-2016 08:49 AM

whether the bolts come right out or not, it's being done at home, LOL. I'll either unbolt it or cut the bolts off. I have 2 stock gaskets already from my sentra exhaust project ! I will only use those multi layer metal OEM gaskets, learned all about exhaust gaskets working on my former 87.

In the sentra, I knew the cat was clogged so I took it off, and removed everything inside, put it back on but the noise the exhaust made just swirling around in the empty cavity and the exhaust fumes were driving me crazy, so I was going to just remove it, but i found I could not bolt the flanges together ( I cut the pipe after the second flange, thinking I could bolt them together than just add a short piece of pipe to tie it back together) because the pipe sticks out through the flange. So I found a piece of 1" thick steel at work in the scrap pile and brought it home. I ended up making a spacer to go between the 2 flanges, I did all the machining work using a drill, sawzall and carbide grinding tip in my air grinder, it was a bitch working with steel that thick and took me about a week. Metal shavings everywhere !

I finally installed the spacer with new gaskets and it leaked like crazy. Ended up cutting both flanges off, which I didn't want to do and straight piped it, sold it as scrap after selling it to my step daughter and her BF and they killed it.

I kept the spacer and flanges.

ahardb0dy 09-27-2016 08:52 AM

Quote:

Originally Posted by swampyankee (Post 464875)
Find the local guy that buys used cats.
I got $25.00 for my old one.

Good idea, thanks

cadillacdude1975 09-28-2016 12:29 AM

most salvage yards buy old cats...........back when the platinum was really high about ten years ago, i know someone who made 4 grand off old cats. he was a shop foreman and they had a fleet who changed all that shit religiously on set mileage. he saved the old cats for 6 months, and made a fortune.

LugNut1990 09-29-2016 02:46 AM

I put in one of those Walkers a few years ago. I remember having to order some more parts to complete the job, e.g., hanger(s) and gaskets. Also previously went with the Walker cat-back muffler. All fit very well on my KA24E D21.

ahardb0dy 10-03-2016 05:01 AM

Ordered the catalytic converter, trying to find someone who stocks the muffler.

swampyankee 10-03-2016 03:10 PM

Quote:

Originally Posted by ahardb0dy (Post 465255)
Ordered the catalytic converter, trying to find someone who stocks the muffler.

I bought and installed this set up.
Got it from Advanced auto for $80.00 with gaskets and free shipping. (there's lots of coupons for Advanced out there).
Complete exhaust with resonator and tail pipe. Easy install. Rock auto also carries this.
https://www.coupons.com/coupon-codes...3b542e5&lbox=1

Bosal Exhaust Part No. 283-237

http://www.qcsonline.net/bosalb2b/pr...37-1.jpg?39330


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