Anyone have there cat gutted and a staright pipe put through the center of the cat and have the cat welded back on?
Does it make the car louder, any more power?
i heard it gives more power, and makes the exaust note louder, any truth?
I have a highflow cat, would there be much sence in me doing this or is it basically accomplishing the same thing?
thanks
98 j-body sedan
you might actually lose power if you do that. the only reason you would need to do that if you are pushing a lot of HP. like 400. i thinks its mainly the V8s who do that
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I noticed alot more power on my '91 cavy when I gutted the cat. Better pull allover the power band. However that car was OBDI and had only one O2 sensor.
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keep the cat or a highflow cat, unless you are boosted.
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I can vouch for the extreme sound. However, I don't think it lost power. It seems to have gained a little pull at higher RPMs without really losing anything down low. I like it, but it is loud.
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I have heard of doing this and when I consulted a garage the specifies in building drags they told me I would need a little back pressure or I would lose HP the best combo would be to put on hedders with a 2.25 inch pipe and a high flow cat. it would give my 2.2L enigne some needed back pressure and would work great with spooling a turbo.
I want to make my car louder, but i dont want to loose any power, humm not sure what to do, i already have a 4-2-1 header, 2.25 inch pipeing and a muffler, and a high flow cat.
98 j-body sedan
Making your car louder and making your car obnoxious is 2 different things. Keep the cat on the sound reasons, inspection reasons and power reasons cause you might lose some.
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NJHK (Sexual Chocolate) wrote:Making your car louder and making your car obnoxious is 2 different things. Keep the cat on the sound reasons, inspection reasons and power reasons cause you might lose some.
I second that. Now you can accomplish both at the same time with a straight pipe. But with that you lose power and gain the chance of getting pulled over, as I recieved 2 modified exhaust tickets in the four months I ran straight pipe.
I was a retard, and now I'm permanently banned.
James Cairns wrote:I have heard of doing this and when I consulted a garage the specifies in building drags they told me I would need a little back pressure or I would lose HP the best combo would be to put on hedders with a 2.25 inch pipe and a high flow cat. it would give my 2.2L enigne some needed back pressure and would work great with spooling a turbo.
Make sure you don't take your car there again...you get more backpressure than you need just having a pipe run the length of your car, what you need is exhaust velocity. This is mainly accomplished through the correct pipe size, 2.25" is great for NA. However, on a turbo engine, the best exhaust is no exhaust...no exhaust means no back pressure. Your exhaust should be as large and short as possible, as it will NOT 'help' your turbo to spool. Not to mention that it would take an eternity to spool a decent sized turbo with a 2.25" exhaust.
NJHK (Sexual Chocolate) wrote:Making your car louder and making your car obnoxious is 2 different things. Keep the cat on the sound reasons, inspection reasons and power reasons cause you might lose some.
...and to help keep the environment 'clean'...
<img src=http://hometown.aol.com/yogiandbooboo7/images/french.jpg>
^^^ that too but usually people don't care about the enviornment LOL
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So i guess i should keep the cat on eh,lol
How long does a cat usually last for before it needs replacing, i had my highflow for 2.5 years, i am not sure if its still working good, is there a way to test it, like would i know if it is clogged a bit, and what clogs a cat up?
thanks everyone.
98 j-body sedan
terry denomme wrote:So i guess i should keep the cat on eh,lol
How long does a cat usually last for before it needs replacing, i had my highflow for 2.5 years, i am not sure if its still working good, is there a way to test it, like would i know if it is clogged a bit, and what clogs a cat up?
thanks everyone.
I believe symptoms are smelling of "eggs" or you notice power loss/hesitation.
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High flow cats are like 99% free flowing so to gut them is just a waste of money. HotRod mag did a test Y E A R S ago and found that the high flow cats only cost high horsepower V-8's about 1 or 2 horses so its not even noticable.
Semper Fi SAINT. May you rest in peace.
gutting a high flow cat creates a hollow for exhaust gas to expand in.... lowers the velocity, hence lowers overall performance...
sure you might feel pull in the upper, but its no different than an oversized TB... shifts power band higher than most will use normally.
when people claim they gain power, its prob because your stuff was already clogged or on its way to being clogged.
on reg cars, non boost forced induction, cats usually help. and most cats flow well enough to offset any thought restriction as the catalyst heats and stays hot which keeps exhaust gases flowing fast, hence the reason most gain from having one...
like said above, keep backpressure low, exhaust velocity high. keeps the torque, punch off the line as well as the pull up top and make sure there are NO leaks.
Thanks very much event, i no longer want to remove my cat, lol
I just got to get my exaust checked for leaks and then i will stick with what i have.
98 j-body sedan
