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post #1 of (permalink) Old 03-26-2001, 03:10 PM
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Which Cat?

I am ready to replace my catalytic converter (have to keep it) and am wondering which is the best to buy. Has anyone tried the high flow models and is there a difference that makes them better than a stock replacement?

As always, I appreciate any opinions and experiences rendered. Thanks!

92 YJ/4.OL I6/ 4"Superlift/1" Daystar Poly Body Lift/ 32X11.5 BFG's/8K lb Superwinch/Yada, Yada, Yada,

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post #2 of (permalink) Old 03-26-2001, 08:32 PM
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Re: Which Cat?

When I was replacing one on a 3.0 I looked at a few different universal replacements(non hi-flow). The one I got was rated for use on up to a 350ci engine. It had 2.25" inlet and outlet and the outlets were a smooth funnel shape that would let the exhaust flow smoothly in and out. The interior welds and joints should be smooth also or be able to be ground down smooth. I did this because I read an article that basically said that the inlet/outlets are the source of most backpressure and turbulence in a good converter.

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post #3 of (permalink) Old 03-26-2001, 10:30 PM
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Re: Which Cat?

Hey...the aftermarket performance or upgraded catalytic converters will add some horespower...but the actuall benifit is the price difference. The factory replacement cat will cost you about $400+/-...an aftermarket performance cat from Summitracing.com are much cheaper...or try a local speed shop they have ones from Walker, Dynomax and Flowtech...Walker/Dynomax are the same companies and the 2 1/4" high flows go for $64.99 at my shop...but shop around...and also your cat style is the same 'honeycomb' style but the aftermarket is shorter in length but is worth the swap. You will have to add a small mid-pipe to make up the difference in the cat length difference...

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