Diy cat replacement kit question?

Diy cat replacement kit question?

Postby Cologne [OP] » May 20th 2017, 11:38pm

I tried doing a search first but no results. So i wanted to change my cat out to a high flow.
My cat is one piece to pipe stock. Ill need to cut it off.

Does anyone have a good choice for hi flo cat plus sleeve kit/ parts list?

Thanks for replies if any...:)

98 gmc safari awd stock exuast now and new engine.
98 GMC Safari/ Cargo van AWD (200k miles) With Big AssFat Wheels = P295/50R-15 Proxes
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Re: Diy cat replacement kit question?

Postby TurnNburnTurnNburn is online! » May 22nd 2017, 5:14pm

I have used high flow cats on cars where emissions were an issue and completely deleting them was not an option. The CEL did come on sometimes for cat efficiency codes, obviously because higher flow cats are doing less to clean the exhaust. High flow cats are cheap for a reason. I had to use "oxygen sensor extenders" to pull the sensor out of the stream and the CEL stopped coming on.

As for brand names, I couldn't tell you, I just went to my local exhaust shop and had them do it.
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Re: Diy cat replacement kit question?

Postby markmitch » May 22nd 2017, 5:34pm

you will need to find one that will fit such as if your pipe is 3" buy a cat for a 3" exhaust then go to an local auto parts store. Take the cat with you and find the sleeves that fit over it get four clamps and you should be fine however as for the 02 I have no clue.
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Re: Diy cat replacement kit question?

Postby AstroWill » May 22nd 2017, 7:41pm

I honestly wouldn't bother for the extremely small increase at the top end. Unless something is wrong with yours(coated/clogged/physically damaged) you just aren't going to see any real benefit.
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Re: Diy cat replacement kit question?

Postby Cologne [OP] » May 22nd 2017, 8:00pm

Thanks all for replies. Yeah doesnt sound like the trouble is worth it.

Thanks again. :)
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Image cutout back of front wells + 4" bump stops.

CARBON IS THE KILLER! Know this...
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Re: Diy cat replacement kit question?

Postby dryhumor » May 27th 2017, 2:41am

Cologne wrote:I tried doing a search first but no results. So i wanted to change my cat out to a high flow.
My cat is one piece to pipe stock. Ill need to cut it off.

Does anyone have a good choice for hi flo cat plus sleeve kit/ parts list?

Thanks for replies if any...:)

98 gmc safari awd stock exuast now and new engine.



If you were closer, I just pulled the high flow cat and Y pipe off my 98. I don't need it anymore. Bolt on for your application. Got a dead V6 if you want that as well. hehe.
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Re: Diy cat replacement kit question?

Postby Cologne [OP] » May 27th 2017, 3:42am

Thats really nice thanks. I bet if u part it all out u could make a good chunk of mulla. :)
98 GMC Safari/ Cargo van AWD (200k miles) With Big AssFat Wheels = P295/50R-15 Proxes
Image cutout back of front wells + 4" bump stops.

CARBON IS THE KILLER! Know this...
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Re: Diy cat replacement kit question?

Postby timothy47130 » June 8th 2017, 4:55pm

I used a universal magnaflow highflow on my 99 ranger from orilly auto parts and it would throw a code almost everything I got into the throttle hard. Had to do the O2 sensor spacer thing to it. But it was only $55 for the cat. By the time I scraped the old cat the repair was free. Scrap price covered the new cat, adapter and pipe.lol
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Re: Diy cat replacement kit question?

Postby five10freak » June 9th 2017, 2:58am

Almost every car i've owned has had it's cat. replaced with a high flow version. My astro is no exception, I used a random technologies high flow cat.. I've had nothin but great results with no issues at all. The two companies I typically use is Catco cats and Random technologies.
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