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Factory catalytic converters -VS- Magnaflow cats? #4667135
02/15/18 06:36 PM
02/15/18 06:36 PM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
Florida
Is there any difference in sound and performance between factory cats on a 2000 F150 , compared to the Magnaflow catalytic converters?

Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy] #4667156
02/15/18 06:52 PM
02/15/18 06:52 PM
Joined: Feb 2013
Posts: 11,081
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 11,081
Phoenix, AZ
Nope. I put a Magnaflow high-flow cat on my Jeep last summer. Made no difference at all. My original cat was broken inside from off-roading and smashing it. Nice and quiet too.


2015 Hyundai Sonata 2.4L 88k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy] #4667168
02/15/18 07:05 PM
02/15/18 07:05 PM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
Florida
If both diff. cats have that screen it will slow down air flow no matter what. I'm curious if its a absolute 100% fact that having no cats on a 2000 f150 v8 it will decrease in horsepower? I wish I could find an actual dyno demo video showing this test.

Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy] #4667169
02/15/18 07:05 PM
02/15/18 07:05 PM
Joined: Jun 2005
Posts: 11,611
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,611
Santa Barbara, CA
Probably the Magnaflow ones are available while the OEM replacement cats are most likely obsolete.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy] #4667199
02/15/18 07:30 PM
02/15/18 07:30 PM
Joined: Aug 2017
Posts: 663
MN
14Accent Offline
14Accent  Offline
Joined: Aug 2017
Posts: 663
MN
Originally Posted By: lawnguy
If both diff. cats have that screen it will slow down air flow no matter what. I'm curious if its a absolute 100% fact that having no cats on a 2000 f150 v8 it will decrease in horsepower? I wish I could find an actual dyno demo video showing this test.


No cats? Yes, it's 100% proven that bone stock Modular motors like to have a little back pressure in the exhaust, regardless of 4.6/5.4/6.8 or the chassis it's installed in.

You have 4 cats on that 2000. Only the front two are monitored by the PCM. Have an exhaust shop cut out and straight pipe the rear two cats. No check engine light, and a decent "seat of the pants" gain in power.

Google/youtube "F150 rear cat delete" or "Crown vic rear cat delete". You'll see.


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

2003 Cadillac Seville STS - The winter "beater", it uses the Volt's fuel
Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy] #4667212
02/15/18 07:40 PM
02/15/18 07:40 PM
Joined: Mar 2008
Posts: 7,318
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,318
USA
The sound level should be the same. Remember, the mufflers and resonators have much more of an effect on the sound than the cats do smile

Re: Factory catalytic converters -VS- Magnaflow cats? [Re: slacktide_bitog] #4667274
02/15/18 09:10 PM
02/15/18 09:10 PM
Joined: Jun 2005
Posts: 11,611
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,611
Santa Barbara, CA
Originally Posted By: slacktide_bitog
The sound level should be the same. Remember, the mufflers and resonators have much more of an effect on the sound than the cats do smile


You would be surprised. I swapped in an offroad X pipe on my 98 Mustang GT replacing the factory 6 cat H pipe and it was substantially louder.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy] #4667363
02/16/18 12:07 AM
02/16/18 12:07 AM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
S California
There is a bit of buzz involving Ford cats recently.

Ford's Catalytic Converter Eliminates Use of Platinum

LINK

Re: Factory catalytic converters -VS- Magnaflow cats? [Re: 14Accent] #4667365
02/16/18 12:22 AM
02/16/18 12:22 AM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
Florida
Where are the 02 sensors located at in relation to the front or rear cats?

Originally Posted By: 14Accent
Originally Posted By: lawnguy
If both diff. cats have that screen it will slow down air flow no matter what. I'm curious if its a absolute 100% fact that having no cats on a 2000 f150 v8 it will decrease in horsepower? I wish I could find an actual dyno demo video showing this test.


No cats? Yes, it's 100% proven that bone stock Modular motors like to have a little back pressure in the exhaust, regardless of 4.6/5.4/6.8 or the chassis it's installed in.

You have 4 cats on that 2000. Only the front two are monitored by the PCM. Have an exhaust shop cut out and straight pipe the rear two cats. No check engine light, and a decent "seat of the pants" gain in power.

Google/youtube "F150 rear cat delete" or "Crown vic rear cat delete". You'll see.

Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy] #4667477
02/16/18 07:23 AM
02/16/18 07:23 AM
Joined: Dec 2002
Posts: 42,293
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,293
New Jersey
If you have emissions testing (or even if not, nobody anywhere likes to sit behind an obnoxiously stinky vehicle), you should at minimum ensure you find a cat with a CARB rating.

My 91 BMW was having issues with high NOx emissions. Everything ran perfect, so it was resolved to be a catalyst issue. IIRC failing was around 1200ppm, and my OE cat was on the cusp. Swapped in a manga flow and I barely passed. Somewhere in the 1170s, as I recall. Two years later, failed again.

Bit the bullet and got an OE converter, I passed with 14ppm.

So the OE converter was around 100x better.

Re: Factory catalytic converters -VS- Magnaflow cats? [Re: JHZR2] #4667516
02/16/18 08:03 AM
02/16/18 08:03 AM
Joined: Nov 2006
Posts: 20,569
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,569
MA, Mittelfranken.de
There is a lot more wash coat on OE and they don't rust like aftermarket.


ASE L1, Master. Deutsch Meisterbrief.
Re: Factory catalytic converters -VS- Magnaflow cats? [Re: JHZR2] #4667738
02/16/18 10:58 AM
02/16/18 10:58 AM
Joined: Sep 2004
Posts: 7,809
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,809
Marshfield , MA
Originally Posted By: JHZR2
If you have emissions testing (or even if not, nobody anywhere likes to sit behind an obnoxiously stinky vehicle), you should at minimum ensure you find a cat with a CARB rating.

My 91 BMW was having issues with high NOx emissions. Everything ran perfect, so it was resolved to be a catalyst issue. IIRC failing was around 1200ppm, and my OE cat was on the cusp. Swapped in a manga flow and I barely passed. Somewhere in the 1170s, as I recall. Two years later, failed again.

Bit the bullet and got an OE converter, I passed with 14ppm.

So the OE converter was around 100x better.


The BMWs Boysen exhaust weighed about twice what My jeep's system weighed. About 275 K miles it failed emissions for NOx, I replaced the original O2 sensor and treated the fuel with some pink glop that was designed to help jet liners burn cleaner. It worked and I got another 3 yrs out of the cat. Your experience with after mkt cats exactly meshes with tales from the E 28 forum.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy] #4667821
02/16/18 12:28 PM
02/16/18 12:28 PM
Joined: Jan 2004
Posts: 4,445
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,445
California
OE cats are made to CARB standards(more precious metal in the washcoat) - and they flow better. Aftermarket cats might not flow as well and don't last as long. I had 2 Walker CARB-compliant cats welded in after my OEM Futaba ones died due to misfires and while the car did pass smog I noticed a huge drop off in performance. The Walkers were much smaller than the OEM Toyota cats. The inlet/outlet were the same but the catalytic substrate was much smaller.

Last edited by nthach; 02/16/18 12:29 PM.

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