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SE Level Member
03-09-2018
Hey gang. I have an 08 na 3.8l with 225 000 kms and I need to replace the cat.....again. I bought a walker cat but this time I'm thinking of spending more and buying the bosal cat. Just wondering if anyone used it on here andy how it worked out. I DO NOT WANT TO DO THIS AGAIN lol. But serves me right I guess cuz when I did my lim I didn't torque to it to spec and didn't goop the corners which killed the 1st one.
Thanks
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#2
Re: Which cat is better
03-09-2018
97 GTP Sold-prolly rusted away by now
2011 F-150 Yote powered
Too Hot to Handle, Too Cold to Hold
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#3
Re: Which cat is better
03-09-2018
you would need a stock replacement or you'll get a cat code.
whats wrong with the one you got now? cant see no rtv in the corners of a lim killing a can. they need to run pig rich to kill one fast.
if you have a high flow cat now, thats the issue i bet. cars not gonna like that hi flow cat.
you got a code for a cat?
![](http://i.imgur.com/In0Qnqi.jpg)
98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails
L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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#4
Re: Which cat is better
Turbo is the way to go.
03-09-2018
I think he means the engine was burning a lot of coolant with a improper install of the LIM. Lots of coolant or oil burning will wipe out the converters faster than some think.
![](https://www.grandprixforums.com/image.php?u=8713&type=sigpic&dateline=1312942437)
SMGPFC Member #1
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#5
Re: Which cat is better
SE Level Member
03-11-2018
The cat is plugged from coolant andy a ridiculous amount of oil being burned by the lim job done wrong. The can't get the car over 3500 rpm. I just want cheapest fix possible. But yet I need it work right. If I delete the cat amd get a code would that effect gas mileage and overall performance of the engine?
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#6
Re: Which cat is better
SE Level Member
03-11-2018
And yes I'm getting a code. 420 for cat. I plan on keeping it till I scrap it so want to do the right thing.
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#7
Re: Which cat is better
Turbo is the way to go.
03-11-2018
Yes, no cat will always cause a code and poor mileage in your year car.
I say either cat will work, a new walker or the bosal cat. Both have warranties too.
![](https://www.grandprixforums.com/image.php?u=8713&type=sigpic&dateline=1312942437)
SMGPFC Member #1
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#8
Re: Which cat is better
GT Level Member
03-12-2018
I bought a ebay high flow cat and use the spark plug nonfouler trick to pull the 02 sensor out of the exhaust stream a little to not get a light.
04 GP GT- top swap, VS cam, 2.8 pulley, E85, headers, 60 injectors, TEP 3:29 trans, Racelogic Traction Control, ZZP dyno tuned.
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Post Thanks / Like - 0 Thanks, 1 Likes, 0 Dislikes
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#9
Re: Which cat is better
Donating Users
Chris B
2009 CX-9
** SOLD ** 2002 GT
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#10
Re: Which cat is better
03-12-2018
damn fools put a U bend in it, that blows.
![](http://i.imgur.com/In0Qnqi.jpg)
98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails
L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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#11
Re: Which cat is better
GrandPrix Junkie
03-13-2018
yep that's why i went with a bosal one once. no u-bend. I've been running a zzp cat-less downpipe for years and I love it cause I'll never have to worry about a cat again. Obviously I have a tune to eliminate the light along with other things.
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#12
Re: Which cat is better
Donating Users
03-13-2018
![Quote](https://www.grandprixforums.com/images/redfox/misc/quote_icon.png)
Originally Posted by
Scottydoggs
damn fools put a U bend in it, that blows.
That's the only way to call it OE replacement. LOL
Chris B
2009 CX-9
** SOLD ** 2002 GT
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#13
Re: Which cat is better
Turbo is the way to go.
03-13-2018
The u-bend in the aftermarket ones do not get as small as the factory pipe though, they kept the design so the o2 sensor would fit in the same spot.
![](https://www.grandprixforums.com/image.php?u=8713&type=sigpic&dateline=1312942437)
SMGPFC Member #1
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#14
Re: Which cat is better
GT Level Member
09-27-2018
Can't speak for Walker or Bosal cat converters although I can tell you Bosal did make the factory catback for our cars (at least on the Grand Prix GT/GTPs). From my personal experience though I used the cat that came with the SLP headers. The first one lasted about 2 years. The 2nd one lasted about 6 years. After that 2nd SLP cat I couldn't find anymore available out there so I went with a Magnaflow hi-flow universal cat. I've had that one about 5 years so far no issues. The aftermarket units are kind of a mixed bag. I would go with one that has a better warranty