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Angeles98
Newbie


Name : Alex Angeles
Joined : 2019-09-12
Post Count : 4
Merit : 0

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PostSubject: Catalytic converters   Catalytic converters EmptySat May 02, 2020 11:47 pm

Soo my cat converter was clogged up and got to the point where is made a loud pop one day and guessing it gave it. Car sounds raspy as hell due to exhaust leak and wondering what type of replacement option would be best. Should I go stock replacement or something better? 1998 Riviera
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LARRY70GS
Aficionado
LARRY70GS

Name : Larry
Age : 63
Location : Oakland Gardens, NY
Joined : 2007-01-23
Post Count : 1741
Merit : 116

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PostSubject: Re: Catalytic converters   Catalytic converters EmptySun May 03, 2020 8:56 am

I used the Walker 15817,

https://www.rockauto.com/en/catalog/buick,1998,riviera,3.8l+v6+supercharged,1303322,exhaust+&+emission,catalytic+converter,5808

It may depend on where you live. RA may not ship a converter to certain states due to differing emissions regulations.

_________________
98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU
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Rickw
Guru


Name : Rick
Location : Lancaster, MA
Joined : 2008-09-13
Post Count : 6251
Merit : 116

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PostSubject: Re: Catalytic converters   Catalytic converters EmptyThu May 07, 2020 5:46 am

I used a high flow Flowmaster unit but I had installed headers and other parts for a freer flowing exhaust and a PCM tune, and smaller SC pulley.

For a stock engine in a State where they still do smog checks then get a Walker made as an exact replacement.

Put a new O2 sensor in it while your replacing parts.
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albertj
Master
albertj

Name :
Location : Finger Lakes of New York State
Joined : 2007-05-31
Post Count : 7681
Merit : 161

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PostSubject: Re: Catalytic converters   Catalytic converters EmptyFri May 08, 2020 1:45 pm

Angeles98 wrote:
Soo my cat converter was clogged up and got to the point where is made a loud pop one day and guessing it gave it. Car sounds raspy as hell due to exhaust leak and wondering what type of replacement option would be best. Should I go stock replacement or something better? 1998 Riviera

While you are at it, it would not be a waste of time to figure out how your converter got clogged in the first place. Could be...

- oil additives with a lot of zinc or other phosphates can plate the converter over time if you are burning oil for whatever reason. Use good oil and leave the mechanic-in-a-can on the shelf.
- running rich due to lack or mis-maintenance or a funky tune.


Reason I say this -- in almost 400,000 miles on my '98 Riv I've never plugged a converter. Something is wrong, you might want to spend a couple minutes eliminating any obvious causes...
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