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  #1  
Old 10-22-2009, 09:40 PM
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High flow cats?

Is it worth going aftermarket on the catalytic converters?
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Old 10-22-2009, 10:28 PM
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Re: High flow cats?

only if you have to replace the stock ones due to corrosion or failure
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Old 10-22-2009, 10:36 PM
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Re: High flow cats?

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Originally Posted by Scottina06 View Post
only if you have to replace the stock ones due to corrosion or failure
x2
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Old 10-22-2009, 11:58 PM
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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.
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  #5  
Old 10-23-2009, 12:00 AM
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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..
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Old 10-23-2009, 10:14 AM
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Re: High flow cats?

also see the o2 sensor for cats thread
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Old 10-23-2009, 10:39 AM
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Re: High flow cats?

IMO...unless you have other supporting mods...the cats arent gonna do much on an otherwise stock vehicle
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Old 10-23-2009, 11:12 AM
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Re: High flow cats?

Quote:
Originally Posted by Scottina06 View Post
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.
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Old 10-23-2009, 11:35 AM
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Re: High flow cats?

so you had a stock vehicle and added aftermarket cats and got .35?
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Old 10-23-2009, 11:38 AM
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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
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Old 10-23-2009, 11:43 AM
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Re: High flow cats?

Quote:
Originally Posted by Scottina06 View Post
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.
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Old 10-23-2009, 11:45 AM
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Re: High flow cats?

youve got a very good butt dyno....LOL
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