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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.


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


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.

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