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The best "UNIVERSAL" catalytic converter???? #4536592
10/07/17 09:01 PM
10/07/17 09:01 PM
Joined: Aug 2017
Posts: 108
USA
crazy_raccoon Offline OP
crazy_raccoon  Offline OP
Joined: Aug 2017
Posts: 108
USA
I figure you guys could help me out on this one. I'm on the market for a very good universal catalytic converter that I could weld to a custom mid-pipe I plan on getting made and would like to pass emissions. Piping will be 2.25" in the custom mid-pipe. Even though I will be in an emission free county I would still like to pass. I recently installed a aftermarket header that removes my primary cat on my '07 Scion TC and I'm still currently running my OEM mid-pipe with the secondary cat on there. I do get that go-kart smell when I'm in idle though.

I'm curious if there are aftermarket cats that actually lasted a long time and of are good quality? Feed back from your experiences would be highly appreciated.


'07 Scion tc
- 98K miles
- Valvoline FS w/ML 0W-20 D1G2
- FRAM Ultra
'07 Honda Accord coupe 4cyl
- 128K miles
- Valvoline FS w/ML 0W-20 D1G2
- FRAM TG
Re: The best "UNIVERSAL" catalytic converter???? [Re: crazy_raccoon] #4536632
10/07/17 09:47 PM
10/07/17 09:47 PM
Joined: Apr 2006
Posts: 9,278
Birmingham, AL
01rangerxl Offline
01rangerxl  Offline
Joined: Apr 2006
Posts: 9,278
Birmingham, AL
I installed a Walker direct fit y-pipe with 2 converters on my '02 Ranger somewhere around 4 years/60K miles ago and it's still doing good. I have used other Walker and Dynomax parts and have nothing but good to say about them.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 224K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 200K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 246K miles
Re: The best "UNIVERSAL" catalytic converter???? [Re: crazy_raccoon] #4536642
10/07/17 10:01 PM
10/07/17 10:01 PM
Joined: Apr 2012
Posts: 5,601
MA
Wolf359 Online content
Wolf359  Online Content
Joined: Apr 2012
Posts: 5,601
MA
If you cared about the environment or the air you and your neighbors breathe, you wouldn't have taken it out.

The problem with aftermarket cats is that they don't have to meet the same warranty requirements as OEM. The manufacturers have to make their cats last 8/80k under federal emissions warranty and they're designed to last at least that long and usually much longer if properly maintained. To do that, there's a lot more material in the converter which makes it more expensive. No aftermarket convert is going to meet the same standard because it's going to cost a lot more and by the time you hit the aftermarket, the owners are looking for something cheap. That's why they typically only have a 25k warranty on the converter and a 50k warranty for structural integrity. The EPA figures that by the time the 2nd one really goes, that's going to be about it for the car.

Re: The best "UNIVERSAL" catalytic converter???? [Re: Wolf359] #4536708
10/07/17 11:22 PM
10/07/17 11:22 PM
Joined: Aug 2008
Posts: 2,188
Cali
Malo83 Offline
Malo83  Offline
Joined: Aug 2008
Posts: 2,188
Cali
I have a Magnaflow 3" HiFlow cat on my 83 Silverado that I have been running for 10 yrs now, driving in Cali I have to do smog tests every 2 yrs, no failed tests yet. thumbsup

Re: The best "UNIVERSAL" catalytic converter???? [Re: crazy_raccoon] #4536726
10/07/17 11:56 PM
10/07/17 11:56 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
You don't say where you live but if you're in CA like me, the number on the converter must match the number on the hood sticker. Getting a universal will not pass.

Re: The best "UNIVERSAL" catalytic converter???? [Re: crazy_raccoon] #4536896
10/08/17 07:55 AM
10/08/17 07:55 AM
Joined: Jun 2003
Posts: 33,592
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,592
ME
If it doesn't get hot enough it won't work. IDK if a 2.25" pipe will flow "too well" for it to get hot, but coupled with distance from the engine, that could be your issue.

If your rear o2 sensor is in front of the rear cat (like my camry) a spark plug anti fouler will take care of the light.

Re: The best "UNIVERSAL" catalytic converter???? [Re: eljefino] #4537068
10/08/17 10:55 AM
10/08/17 10:55 AM
Joined: Aug 2017
Posts: 108
USA
crazy_raccoon Offline OP
crazy_raccoon  Offline OP
Joined: Aug 2017
Posts: 108
USA
Originally Posted By: eljefino
If it doesn't get hot enough it won't work. IDK if a 2.25" pipe will flow "too well" for it to get hot, but coupled with distance from the engine, that could be your issue.

If your rear o2 sensor is in front of the rear cat (like my camry) a spark plug anti fouler will take care of the light.


I was wondering about the heat issue as well for it to perform correctly. The rear O2 sensor is mounted on the pipe about a foot away from the secondary cat. I already have a CEL 90 degree elbow eliminator where the rear O2 sensor mounts so the CEL is not activated. I just wasn't sure if there is a universal cat that would be good for my setup I'm going for.


'07 Scion tc
- 98K miles
- Valvoline FS w/ML 0W-20 D1G2
- FRAM Ultra
'07 Honda Accord coupe 4cyl
- 128K miles
- Valvoline FS w/ML 0W-20 D1G2
- FRAM TG
Re: The best "UNIVERSAL" catalytic converter???? [Re: crazy_raccoon] #4537999
10/09/17 11:58 AM
10/09/17 11:58 AM
Joined: Jan 2004
Posts: 4,475
California
nthach Online content
nthach  Online Content
Joined: Jan 2004
Posts: 4,475
California
Unless you get a CARB-compliant cat - and Ozone Transport Commission states that follow most of CARB's regulations also mandate them for aftermarket replacement on newer cars no aftermarket cat will last as long as OEM. Federal cats don't have as much precious metal loading or construction as the CA units do.

Since you're in a non-emissions area, you can get high-flow metal matrix cats from Flowmaster and Magnaflow. I'd just get an appropriately-sized cat. I used Walker and that helped me pass smog but killed performance. If I had to do it again, Magnaflow.

Re: The best "UNIVERSAL" catalytic converter???? [Re: crazy_raccoon] #4538817
10/10/17 07:13 AM
10/10/17 07:13 AM
Joined: May 2008
Posts: 2,101
SoCal
UG_Passat Offline
UG_Passat  Offline
Joined: May 2008
Posts: 2,101
SoCal
HJS is the best, but you also pay for it, as they are quite expensive


2016 VW Tiguan|APR Stage 1|Neuspeed P-Flo|Osram CBI|Redline 5w30
Re: The best "UNIVERSAL" catalytic converter???? [Re: crazy_raccoon] #4538946
10/10/17 09:35 AM
10/10/17 09:35 AM
Joined: Apr 2010
Posts: 4,559
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline
Joined: Apr 2010
Posts: 4,559
Storrs, Connecticut
I have Walker cats on my Jeep, and they have been on for 50,000+ miles without issue.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (36k) - Castrol Edge Euro 0w40, MANN HU816X
Re: The best "UNIVERSAL" catalytic converter???? [Re: crazy_raccoon] #4540591
10/11/17 07:03 PM
10/11/17 07:03 PM
Joined: Aug 2017
Posts: 108
USA
crazy_raccoon Offline OP
crazy_raccoon  Offline OP
Joined: Aug 2017
Posts: 108
USA
I'm leaning towards a direct fit magnaflow cat but I've read that the California cats they offer are loaded with more metals to curb even more emissions . Not sure if you can get one for a non California vehicle? Anyways, I'm still on the hunt for a decent cat.


'07 Scion tc
- 98K miles
- Valvoline FS w/ML 0W-20 D1G2
- FRAM Ultra
'07 Honda Accord coupe 4cyl
- 128K miles
- Valvoline FS w/ML 0W-20 D1G2
- FRAM TG
Re: The best "UNIVERSAL" catalytic converter???? [Re: crazy_raccoon] #4540789
10/11/17 10:19 PM
10/11/17 10:19 PM
Joined: Apr 2006
Posts: 9,278
Birmingham, AL
01rangerxl Offline
01rangerxl  Offline
Joined: Apr 2006
Posts: 9,278
Birmingham, AL
I think Magnaflow makes quality products, but doesn't do as much test fitting as Walker in some cases. I initially bought a direct fit Magnaflow for my Ranger, but it would not clear the shift cable. I contacted them about it and they said they had other complaints about fitment on FFV 3.0 Rangers...all of which are automatics. All of the non-FFV 3.0s that year were manuals. I suspect it was only ever tested for fitment on a manual trans truck. I returned it for the Walker, which fit perfectly. Not mandrel bent like the Magnaflow, but it fits. I bought a Dynomax (Walker) cat-back exhaust system for another Ranger I had and it also fit perfectly, along with a few Walker direct fit converters for various GM cars and trucks (GMT800s, W-bodies, etc.) I have bought for customer cars...never a problem.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 224K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 200K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 246K miles
Re: The best "UNIVERSAL" catalytic converter???? [Re: crazy_raccoon] #4541133
10/12/17 11:12 AM
10/12/17 11:12 AM
Joined: Jan 2004
Posts: 4,475
California
nthach Online content
nthach  Online Content
Joined: Jan 2004
Posts: 4,475
California
Originally Posted By: crazy_raccoon
I'm leaning towards a direct fit magnaflow cat but I've read that the California cats they offer are loaded with more metals to curb even more emissions . Not sure if you can get one for a non California vehicle? Anyways, I'm still on the hunt for a decent cat.

If you know the part number, you can order it off RockAuto or Amazon.

In NY, you can get get CARB cats as they are mandated for newer cars with 50-state emissions.


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