Cat Selection

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Oct 19, 2005 | 12:20 PM

FstBlkz28

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From: DFW, TX

Cat Selection

I've narrowed my catalytic converter options to two different cats for my new Ypipe setup I'm putting on my car in 2 months.

1. Random Technology 7000 Series, Metal Matrix Bullet Cat. Flows 598cfm
~$215 each

2. Pypes High Flow Mini Cat. Stainless Steel. Flows 450cfm
~$70 each

I've looked all around and these two are the highest flowing cats I've found out there that have the short compact design I'm wanting. The question is, is it worth the extra 300$ for the RT's to get the extra 148cfm on each cat. Obviously the RT's outflow the Pypes, but w/ an engine the size of an LS1 (stock headed, w/ a cam) is the extra flow necessary?

TIA

Last edited by FstBlkz28; Oct 19, 2005 at 12:31 PM.

Oct 19, 2005 | 08:40 PM

Gary98Z

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Have you looked at the Dynatech powercats? I don't know what they flow, but they are the small bullet type of cats. They run about $165/ea from Summit.

Oct 19, 2005 | 08:57 PM

KCS

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I'm pretty sure GM High Tech did a write up on high flow cats. They tested like 12-15 cats including magnaflow, Random tech, and OEM and Chevy Tahoe catalytic converters ended up flowing the best.

Oct 20, 2005 | 12:13 AM

FstBlkz28

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Quote:

Originally Posted by Gary98Z

Have you looked at the Dynatech powercats? I don't know what they flow, but they are the small bullet type of cats. They run about $165/ea from Summit.

The powercat advertises that they flow 398cfm ... or 54% more than the leading competitor ... but obviously if RT is flowing at 598 ... they aren't 54% better than the leading competitor.

Tahoe converters ... hmm I'll have to look into those.

Oct 20, 2005 | 06:14 AM

300bhp/ton

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Quote:

Originally Posted by KCS

I'm pretty sure GM High Tech did a write up on high flow cats. They tested like 12-15 cats including magnaflow, Random tech, and OEM and Chevy Tahoe catalytic converters ended up flowing the best.

I think the thiing to watch here is not just the brand, but the ecact MODEL.

Random Technology make 4 different types of CAT and many different sizes of each, all flow differently. So although they said X make won, just check what it was up against.

Oct 20, 2005 | 06:17 AM

300bhp/ton

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Quote:

Originally Posted by FstBlkz28

I don't know anything about the other make. It might be worth finding out if they are ceramic or metal matrix. If they are ceramic they may require AIR, the metal matrix ones don't.

AIR only runs for the first 20 seconds or so after start up, and helps promote the chemical reaction in the CATS. But if you're trying to build a system to pass emissions it may be worth checking that to see if AIR is required or not.

Oct 20, 2005 | 09:31 AM

FstBlkz28

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My AIR is deleted ... i have run a catted Y before w/o the AIR ... it just doesn't heat them up as fast as w/ the AIR. Both of the CATs will be directly on the header collector so I don't think they could heat up any faster period. Emissions testing isn't a worry, where I am its just OBDII testing for readiness codes. I'm just looking for something that flows really good, but that'll get rid of the 'no cats smell'

I think I'll probly wind up getting the metral matrix 7000 series just so that there is NO doubt in my mind how well they flow. Money really isn't a constraint here.