Recent Topics
better day
by mx5miata
06/19/18 05:26 AM
BRAVO to Officer Wheeles......
by Sayjac
06/19/18 05:17 AM
People Watching ....Airport style.
by ZZman
06/19/18 04:24 AM
Subaru's at play...
by OneEyeJack
06/19/18 03:50 AM
Treating a 2003 Jetta
by llmercll
06/19/18 01:41 AM
Brakes not working - brake pedal sinks
by tookien
06/19/18 12:42 AM
Dave thinks I can make it 12--15k
by Marco620
06/19/18 12:26 AM
'05 Impala front wheel "squeal". Cost !
by Lee4212
06/19/18 12:16 AM
One Dollar Per Gallon?
by Y_K
06/18/18 11:53 PM
Walmart Tightening up Returns
by John_K
06/18/18 10:21 PM
flare nut wrench set
by spasm3
06/18/18 09:46 PM
Auto trans temperature scanner - help!
by JeffKeryk
06/18/18 09:45 PM
How much is too much?
by Sealbilly
06/18/18 09:34 PM
Correct oil filter for a Vovlo S60, 2003
by earthworm
06/18/18 09:17 PM
Prestone coolant $3.50 Target YMMV
by pda1122
06/18/18 09:13 PM
Need Windows 7 Pro ISO
by MONKEYMAN
06/18/18 08:33 PM
PEAK Full Synthetic -- Anyone Try It ??
by johnnyz73
06/18/18 07:40 PM
Why high resale value on Jeeps if frames rust out?
by Vern_in_IL
06/18/18 06:48 PM
Wearever Silver Semi-Metallic Brake Pads- Break In
by ET16
06/18/18 06:37 PM
Where to Buy Motul Oil in Stores?
by Hot_Ajax
06/18/18 06:13 PM
Newest Members
JustaDude, 3horseman, Firedog45, WtsTacoma01, Orion62
65265 Registered Users
Who's Online
45 registered (bradepb, bbhero, 77GrandPrix, BoiseBound, CleverUserName, Char Baby, 7 invisible), 878 Guests and 38 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65265 Members
67 Forums
285578 Topics
4765708 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4667135 - 02/15/18 06:36 PM Factory catalytic converters -VS- Magnaflow cats?
lawnguy Offline


Registered: 08/17/14
Posts: 326
Loc: Florida
Is there any difference in sound and performance between factory cats on a 2000 F150 , compared to the Magnaflow catalytic converters?

Top
#4667156 - 02/15/18 06:52 PM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy]
Nick1994 Offline


Registered: 02/19/13
Posts: 10097
Loc: 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 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

Top
#4667168 - 02/15/18 07:05 PM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy]
lawnguy Offline


Registered: 08/17/14
Posts: 326
Loc: 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.

Top
#4667169 - 02/15/18 07:05 PM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy]
bdcardinal Offline


Registered: 06/03/05
Posts: 10979
Loc: 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.

Top
#4667199 - 02/15/18 07:30 PM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy]
14Accent Offline


Registered: 08/03/17
Posts: 390
Loc: 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!

Top
#4667212 - 02/15/18 07:40 PM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6141
Loc: 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

Top
#4667274 - 02/15/18 09:10 PM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: slacktide_bitog]
bdcardinal Offline


Registered: 06/03/05
Posts: 10979
Loc: 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.

Top
#4667363 - 02/16/18 12:07 AM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7475
Loc: S California
There is a bit of buzz involving Ford cats recently.

Ford's Catalytic Converter Eliminates Use of Platinum

LINK

Top
#4667365 - 02/16/18 12:22 AM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: 14Accent]
lawnguy Offline


Registered: 08/17/14
Posts: 326
Loc: 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.

Top
#4667477 - 02/16/18 07:23 AM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy]
JHZR2 Offline



Registered: 12/14/02
Posts: 41767
Loc: 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.

Top
#4667516 - 02/16/18 08:03 AM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: JHZR2]
Trav Offline


Registered: 11/20/06
Posts: 18836
Loc: MA, Mittelfranken.de
There is a lot more wash coat on OE and they don't rust like aftermarket.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

Top
#4667738 - 02/16/18 10:58 AM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: JHZR2]
andyd Offline


Registered: 09/25/04
Posts: 7136
Loc: 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

Top
#4667821 - 02/16/18 12:28 PM Re: Factory catalytic converters -VS- Magnaflow cats? [Re: lawnguy]
nthach Offline


Registered: 01/02/04
Posts: 3887
Loc: 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.


Edited by nthach (02/16/18 12:29 PM)

Top