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Old 10-27-2019, 09:13 AM   #1
Homecoming1999
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1999 SL2
Default Catalytic Converter fitment.....questions..

So, I want to eventually get my whole catalytic converter assembly replaced, I believe it is original and the piping/clamps look quite poor (like ready to fall apart)..

Why is it for almost every listing I see online, they only show for the SOHC engine and NOT the DOHC engine..

Example here.. Seems like a good price up in Canada.....

https://www.ebay.ca/itm/Catalytic-Co...NcUQNA&vxp=mtr

Is the fitment for SOHC and DOHC the same?

Jason

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Old 10-27-2019, 09:40 AM   #2
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Default Re: Catalytic Converter fitment.....questions..

After around '98 the aftermarket only makes the Fed Emission's level catalytic converter's while the vast majority of the cars use California Emission's. Bosal, I believe, is the only one that makes the right one for '99+; that said I wouldn't be surprised if the '99 is year specific.

They are engine and emission level specific if you want a bolt-on experience even when you find a manufacturer that makes the various options.

Toyota wanted over $500 for the muffler on my aunts Matrix (2-year single car interchange, NOTHING aftermarket...shops wanted over $600 for it plus $100ish to literally bolt it on)...I hunted around for a nearby mechanic with an exhaust pipe bender and the guy was able to make it for under $350 including labor.

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Old 10-27-2019, 02:21 PM   #3
Hiisi
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Default Re: Catalytic Converter fitment.....questions..

I have ordered this one:
amazon
The seller is in Canada and I was waiting for two weeks for the package to be delivered. They have screwed up and twice provide me with the wrong tracking numbers and somehow couldn't mail the package at all initially. After I contacted the seller they sent the part with an expedited delivery and it came within 4 days. I was happy to get it finally and was pleased to see that all the flanges are properly oriented (no cut&welding required). But... There's no mount point for the downstream oxygen sensor. They simply forgot to add it Waiting for the replacement...
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Old 10-27-2019, 04:29 PM   #4
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Default Re: Catalytic Converter fitment.....questions..

Drill a hole in it and have a M18x1.5 O2 sensor bung welded onto it for $20 lol
Bung: https://www.amazon.com/Ledaut-M18X1-.../dp/B01N41391G

I do agree it's a boneheaded mistake you shouldn't have to pay for, especially with it being overpriced to begin with but it sounds like it'd be a faster fix.

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Old 10-27-2019, 04:47 PM   #5
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Default Re: Catalytic Converter fitment.....questions..

As I was mentioning, it seems hard to find a complete setup for the 99 DOHC...I did email the seller....they are actually about 20 mins away from me...

This place here..It says they have sold 26 of them.........

https://www.ebay.ca/itm/1998-1999-Sa...75.c100623.m-1


They say it will fit the 99 DOHC as well.....
But when you do the crosscheck it says only for the SOHC.

Ughhhhh..

Jason

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Old 10-27-2019, 06:50 PM   #6
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Default Re: Catalytic Converter fitment.....questions..

Quote:
Originally Posted by fetchitfido View Post
Drill a hole in it and have a M18x1.5 O2 sensor bung welded onto it for $20 lol
Bung: https://www.amazon.com/Ledaut-M18X1-.../dp/B01N41391G

I do agree it's a boneheaded mistake you shouldn't have to pay for, especially with it being overpriced to begin with but it sounds like it'd be a faster fix.
Thanks, the replacement should arrive tomorrow. I have paid $137 for it. All the bolts and gaskets included. All, but one. What's the size of the bolt that attaches downpipe to the engine? Last time I changed oil I've seen it quite rusty. Most probably will have to replace it also.

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Old 10-27-2019, 06:53 PM   #7
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Default Re: Catalytic Converter fitment.....questions..

Quote:
Originally Posted by Homecoming1999 View Post
As I was mentioning, it seems hard to find a complete setup for the 99 DOHC...I did email the seller....they are actually about 20 mins away from me...

This place here..It says they have sold 26 of them.........

https://www.ebay.ca/itm/1998-1999-Sa...75.c100623.m-1

They say it will fit the 99 DOHC as well.....
But when you do the crosscheck it says only for the SOHC.

Ughhhhh..

Jason
I'm pretty sure the exhaust is standardized for both models. Maybe SOHC owners could measure the distance from some points under the bonnet to the flange of the exhaust manifold? Since blocks on both engines are the same that could be the only source of incompatibility

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Old 10-28-2019, 06:25 AM   #8
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Default Re: Catalytic Converter fitment.....questions..

The 99 DOHCs are a little weird. My 99 SL2 was built in June of 1999 and the aftermarket Magnaflow cat/downpipe didn't fit right. However, the Bosal I have on there now fits great. My SL2 is a standard federal emissions vehicle, not sure if that makes a difference. The Bosal part number is 0795190, bought it from RockAuto a couple years ago for under $200 shipped.

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Old 10-28-2019, 06:45 AM   #9
Homecoming1999
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Default Re: Catalytic Converter fitment.....questions..

Quote:
Originally Posted by Kaervak View Post
The 99 DOHCs are a little weird. My 99 SL2 was built in June of 1999 and the aftermarket Magnaflow cat/downpipe didn't fit right. However, the Bosal I have on there now fits great. My SL2 is a standard federal emissions vehicle, not sure if that makes a difference. The Bosal part number is 0795190, bought it from RockAuto a couple years ago for under $200 shipped.
Did the Bosal kit come with the gaskets/new bolts?

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Old 10-28-2019, 07:16 AM   #10
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Default Re: Catalytic Converter fitment.....questions..

Quote:
Originally Posted by Homecoming1999 View Post
Did the Bosal kit come with the gaskets/new bolts?
Nope, just the downpipe/cat. I use stainless steel fasteners for the exhaust anyway so it wasn't an issue that they weren't included.

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