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#3401761 - 06/19/14 08:01 PM Re: Direct fit catalytic converter install ? [Re: The_Eric]
NMBurb02 Offline


Registered: 09/12/12
Posts: 1396
Loc: Crowntown, CA
Originally Posted By: The_Eric
Originally Posted By: NMBurb02
Originally Posted By: 901Memphis
Check out Eastern Catalytic Direct-fit Converters. I hear some of these GM models are picky about cheaper direct fits than Eastern. My Century had a direct fit from a shop put in 40k ago and its bad again. Someone told me i needed a high wash cat, not sure if this is true or applicable to you, but you might want to research your model thoroughly to see if they are having problems with oem replacements or cheaper. Sometimes a specialty aftermarket piece is needed to fix the issue.

No dice on Eastern. Magnaflow is my only direct fit option.



Why isn't Eastern an option?

I haven't replaced a cat on a Prix that new yet, but if the Magnaflow cat for yours is the same as the the rest, it will be a bit too short and have poor O2 sensor placement, resulting in you having to trim a heat shield back to clear the wires.

Because they don't offer CARB compliant catalytic converters for 2004+ GPs, which is probably precisely because they are so new, therefore there isn't much demand.

The upstream sensor is in the rear exhaust manifold and there are no heat shields on the cat assembly. The pictures make it look like the rear O2 sensor bung is in about the right spot, so I doubt O2 fit would be an issue.
_________________________
2002 Chevy Suburban 1500, G-Oil 5W-30, Napa Gold FIL 4805
2006 Pontiac Grand Prix GT, Valvoline ML NG 10W-30 +MMO, Puro PureOne PL10111

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#3401799 - 06/19/14 08:47 PM Re: Direct fit catalytic converter install ? [Re: NMBurb02]
andyd Offline


Registered: 09/25/04
Posts: 3886
Loc: Marshfield , MA
After finally getting my last 88 Jeep Wagoneer and 3 old 528es past dyno smog testing. MA exempted all pre OBD2 vehicles from emissions. Just an annual safety check.BTW, My 528es all had functioning original cats well past 250 K miles.


Edited by andyd (06/19/14 09:01 PM)
_________________________
2 1988 BMW 528e 20w50 dino, STP filter

1994 Ranger ,600$ Rat, 5w30 dino, STP filter

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#3401839 - 06/19/14 09:26 PM Re: Direct fit catalytic converter install ? [Re: NMBurb02]
tommygunn Offline


Registered: 01/27/11
Posts: 2846
Loc: usa
I found a CARB-legal universal cat for $100 on eBay

Walker part #82618 can often be found for well under $200

Is the previous-gen (97-03) GP exhaust the same as your 04 or interchangeable? If so, then you can probably get away with Davico part #173299 which is still under $400

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#3401853 - 06/19/14 09:41 PM Re: Direct fit catalytic converter install ? [Re: tommygunn]
NMBurb02 Offline


Registered: 09/12/12
Posts: 1396
Loc: Crowntown, CA
Originally Posted By: tommygunn
I found a CARB-legal universal cat for $100 on eBay

Walker part #82618 can often be found for well under $200

Is the previous-gen (97-03) GP exhaust the same as your 04 or interchangeable? If so, then you can probably get away with Davico part #173299 which is still under $400

The exhaust systems could be identical, but the CARB Executive Order (EO) for each part is make and model specific and could exclude later models just because of the model years on the market at the time the EO was issued. The smog testers are supposed to check the part and EO against the vehicle year/make/model, and the parts are actually supposed to come with a sticker with the part and EO numbers to facilitate and the sticker is supposed to be displayed in the engine bay.

Edit: Thanks for the link!


Edited by NMBurb02 (06/19/14 09:48 PM)
_________________________
2002 Chevy Suburban 1500, G-Oil 5W-30, Napa Gold FIL 4805
2006 Pontiac Grand Prix GT, Valvoline ML NG 10W-30 +MMO, Puro PureOne PL10111

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#3402054 - 06/20/14 08:05 AM Re: Direct fit catalytic converter install ? [Re: NMBurb02]
The_Eric Offline


Registered: 03/31/10
Posts: 3521
Loc: Iowa
Originally Posted By: NMBurb02
Originally Posted By: The_Eric
Originally Posted By: NMBurb02
Originally Posted By: 901Memphis
Check out Eastern Catalytic Direct-fit Converters. I hear some of these GM models are picky about cheaper direct fits than Eastern. My Century had a direct fit from a shop put in 40k ago and its bad again. Someone told me i needed a high wash cat, not sure if this is true or applicable to you, but you might want to research your model thoroughly to see if they are having problems with oem replacements or cheaper. Sometimes a specialty aftermarket piece is needed to fix the issue.

No dice on Eastern. Magnaflow is my only direct fit option.



Why isn't Eastern an option?

I haven't replaced a cat on a Prix that new yet, but if the Magnaflow cat for yours is the same as the the rest, it will be a bit too short and have poor O2 sensor placement, resulting in you having to trim a heat shield back to clear the wires.

Because they don't offer CARB compliant catalytic converters for 2004+ GPs, which is probably precisely because they are so new, therefore there isn't much demand.

The upstream sensor is in the rear exhaust manifold and there are no heat shields on the cat assembly. The pictures make it look like the rear O2 sensor bung is in about the right spot, so I doubt O2 fit would be an issue.


Yes, I see now. I went and looked at the manufacturer's stock photos for the 2 applications and they are indeed different- which is good for you.
_________________________
2001 Hyundai Elantra 2.0
1998 Chevy Malibu 2.4
1995 Pontiac Grand Am 3.1
1979 Ford F-150 351M

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#3402246 - 06/20/14 12:57 PM Re: Direct fit catalytic converter install ? [Re: NMBurb02]
tommygunn Offline


Registered: 01/27/11
Posts: 2846
Loc: usa
Originally Posted By: NMBurb02
Originally Posted By: tommygunn
I found a CARB-legal universal cat for $100 on eBay

Walker part #82618 can often be found for well under $200

Is the previous-gen (97-03) GP exhaust the same as your 04 or interchangeable? If so, then you can probably get away with Davico part #173299 which is still under $400

The exhaust systems could be identical, but the CARB Executive Order (EO) for each part is make and model specific and could exclude later models just because of the model years on the market at the time the EO was issued. The smog testers are supposed to check the part and EO against the vehicle year/make/model, and the parts are actually supposed to come with a sticker with the part and EO numbers to facilitate and the sticker is supposed to be displayed in the engine bay.

Edit: Thanks for the link!


You're welcome smile

Get yours before they sell out! Only two left at that great price (and no, I'm not the seller of that cat)

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#3538036 - 11/14/14 01:00 PM Re: Direct fit catalytic converter install ? [Re: NMBurb02]
NMBurb02 Offline


Registered: 09/12/12
Posts: 1396
Loc: Crowntown, CA
If anyone is interested, I ended up taking the car to an exhaust shop 7 weeks ago and they installed a CARB compliant Magnaflow universal fit cat, which ran me about $250 installed, plus $100 for a new flex pipe. The rattle I was experiencing due to the old cat breaking up internally is gone (I still have a slight rattle on hard acceleration coming from the resonator, which may be a piece of the cat that broke up and is now caught in the resonator), the sluggishness and hesitation I was getting during hard acceleration is gone, and gas mileage appears to be up 1+ mpg (~5%) since replacement. I realize the change in fuel economy could be the result of any number of things, including the change to winter fuel, but I think the new cat is mostly responsible for the improvement.
_________________________
2002 Chevy Suburban 1500, G-Oil 5W-30, Napa Gold FIL 4805
2006 Pontiac Grand Prix GT, Valvoline ML NG 10W-30 +MMO, Puro PureOne PL10111

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#3538065 - 11/14/14 01:34 PM Re: Direct fit catalytic converter install ? [Re: NMBurb02]
01rangerxl Offline


Registered: 04/08/06
Posts: 7630
Loc: Birmingham, AL
When a cat has failed in a way that restricts the exhaust, replacing it will cause a dramatic improvement in overall performance...throttle response, MPG, everything. It was night and day when I swapped the y-pipe on my truck.

Glad to hear the issue is resolved, and didn't cost an absurd amount of money.
_________________________
2002 Ford Ranger XLT
3.0 V6 / 5-Speed Automatic / 2WD
160K miles

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#3538125 - 11/14/14 02:47 PM Re: Direct fit catalytic converter install ? [Re: NMBurb02]
HangFire Offline


Registered: 08/21/13
Posts: 629
Loc: Central Maryland
Change to Winter fuel usually hurts fuel economy, not helps it, so combined with your other observations I'd say you probably did get that 1+ MPG back.

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