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-   -   High flow cats? (http://www.jeepgarage.org/f6/high-flow-cats-3529.html)

AcidCold 10-22-2009 09:40 PM

High flow cats?
 
Is it worth going aftermarket on the catalytic converters?

Scottina06 10-22-2009 10:28 PM

Re: High flow cats?
 
only if you have to replace the stock ones due to corrosion or failure

jeeppro 10-22-2009 10:36 PM

Re: High flow cats?
 
Quote:

Originally Posted by Scottina06 (Post 85135)
only if you have to replace the stock ones due to corrosion or failure

x2

FlyinRyan 10-22-2009 11:58 PM

Re: High flow cats?
 
Depends. Are the factory cats ceramic or metallic substrate?

If they are ceramic, then you should replace with aftermarket metallic cats.

I am 99% sure that 04+ 4.7s use ceramic cats in the Y pipe. I would recommend Thunderbolt metallic substrate cats. You should see some gains, the 4.7 reacts very well to exhaust work.

blackpepper 10-23-2009 12:00 AM

Re: High flow cats?
 
I think that the WK is ceramic as well.. I had a cat issue (crack in the Y pipe) and had the whole thing replaced.

I guess I missed this boat.. :lol:

B.P.O.D 10-23-2009 10:14 AM

Re: High flow cats?
 
also see the o2 sensor for cats thread

Scottina06 10-23-2009 10:39 AM

Re: High flow cats?
 
IMO...unless you have other supporting mods...the cats arent gonna do much on an otherwise stock vehicle

FlyinRyan 10-23-2009 11:12 AM

Re: High flow cats?
 
Quote:

Originally Posted by Scottina06 (Post 85267)
IMO...unless you have other supporting mods...the cats arent gonna do much on an otherwise stock vehicle

I have track-proven gains of .35 (after correcting all times) going from a catted 2.5" exhaust to a catless 3" on a stock 4.7. You're entitled to your opinion, but it's incorrect. :lol:

Scottina06 10-23-2009 11:35 AM

Re: High flow cats?
 
so you had a stock vehicle and added aftermarket cats and got .35?

Scottina06 10-23-2009 11:38 AM

Re: High flow cats?
 
thats what your advising these guys...add a aftermarket cat to a stock vehicle on a stock exhaust. You obviously went from the 2.5 to the 3.0 and catless on a 4.7. this is a 3.7 thread with stock exhausts. They will see very, very little to no gains

FlyinRyan 10-23-2009 11:43 AM

Re: High flow cats?
 
Quote:

Originally Posted by Scottina06 (Post 85285)
thats what your advising these guys...add a aftermarket cat to a stock vehicle on a stock exhaust. You obviously went from the 2.5 to the 3.0 and catless on a 4.7. this is a 3.7 thread with stock exhausts. They will see very, very little to no gains

No it isn't. Acidcold owns a 4.7. Try again.........

Oh, and before I went to an aftermarket exhaust I ran a hi flow cat to a stock exhaust. The difference was not night and day but I did feel an improvement off the line.

Edit: Furthermore, a 3.7 is more or less a 4.7 with 2 cylinders removed. so you could surmise that they will still see a majority of the gains that the 4.7s do.

Scottina06 10-23-2009 11:45 AM

Re: High flow cats?
 
youve got a very good butt dyno....LOL


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