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hp gains on cat removal?

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Old 11-23-2010, 11:50 AM
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Default hp gains on cat removal?
I was wondering if i remove my cats by adding this from ws6store.com http://www.ws6project.com/user_stor/...oducts_id=2460 and adding slp's loudmouth catback will i gain hp? or should i just leave the cats on?
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Old 11-23-2010, 12:01 PM
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Well i dont know about HP gains but i went w/ a Mac Off Road Y-pipe w/ manifolds still and on A 98 Z-28 i went 3 tenths faster in the 1/4 so i would say it is worth taking them off !!!!!!
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Old 11-23-2010, 12:21 PM
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Originally Posted by blk/slvr02ss
Well i dont know about HP gains but i went w/ a Mac Off Road Y-pipe w/ manifolds still and on A 98 Z-28 i went 3 tenths faster in the 1/4 so i would say it is worth taking them off !!!!!!
did you still have the stock cats on?
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Old 11-23-2010, 01:24 PM
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An off road y pipe means no cats. I took mine off. I just did it for the sound tho. Got my off road y pipe and headers from texas speed.
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Old 11-23-2010, 01:30 PM
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There are threads with people whom have dynoed before (catted y) and after (ory). They have seen 3-5hp increase with an ory. Is it worth it?
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Old 11-23-2010, 01:37 PM
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We typically see about a 5rwhp gain by eliminating your cats.
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Old 11-23-2010, 03:35 PM
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id put that money towards some LTs if you dont have them.
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Old 11-23-2010, 04:47 PM
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what are your goals then plan it right the first time
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Old 11-24-2010, 06:39 PM
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Originally Posted by ULTIMATEORANGESS
id put that money towards some LTs if you dont have them.
I agree get a set pacesetters headers best bang for buck in the header world.
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Old 11-28-2010, 11:29 PM
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If you could do it cheap go for it, other wise just wait and install some headers!
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Old 11-29-2010, 05:07 PM
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Originally Posted by Z06 Steve
what are your goals then plan it right the first time
I would agree with this. If you will not be making any other changes (yeah right!) then it's fine but if there a possiblilty of doing LTs later, if would be just as well to wait.
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Old 11-29-2010, 05:10 PM
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anytime you are gaining flow (eliminating cats) you will increase power. i agree with the LTs as well.
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Old 11-29-2010, 06:33 PM
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Originally Posted by blk/slvr02ss
Well i dont know about HP gains but i went w/ a Mac Off Road Y-pipe w/ manifolds still and on A 98 Z-28 i went 3 tenths faster in the 1/4 so i would say it is worth taking them off !!!!!!
It sounds like there may have been something wrong besides just the fact that you "had cats". 5 hp != 3 tenths
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Old 11-29-2010, 07:39 PM
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I'm stuck between cats or no cats and 3.73s or 4.10s? I am now leaning towards 3.73s and no cats. My first post on your forum!
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Old 11-29-2010, 08:05 PM
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Originally Posted by Brett777
I'm stuck between cats or no cats and 3.73s or 4.10s? I am now leaning towards 3.73s and no cats. My first post on your forum!
4.10's and no cats.
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Old 11-29-2010, 09:09 PM
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From the numerous dyno threads I've seen on this site over the years, like stated above, 5rwhp seems to be the norm.
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Old 11-29-2010, 10:56 PM
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Originally Posted by JohnJanz@Texas-Speed
We typically see about a 5rwhp gain by eliminating your cats.
About what is the horsepower difference between your catted y-pipe and a offroad y-pipe?
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Old 11-29-2010, 11:54 PM
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I would say you could gain about 15 to the wheels with that and a catback.
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Old 11-30-2010, 12:20 PM
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Originally Posted by gocartone
About what is the horsepower difference between your catted y-pipe and a offroad y-pipe?
That's what I believe they are saying the 5rwhp comes from. High flow catted y-pipe vs ORY.
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