Cat removal?
08-28-2006, 05:28 PM
#1
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Cat removal?
Has anyone taken out their secondary cats and either:
Replaced them with race cats?
or
Replaced tehm with piping?
If so, what were the results.....
-Ghost
Replaced them with race cats?
or
Replaced tehm with piping?
If so, what were the results.....
-Ghost
08-28-2006, 08:12 PM
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01' CLK55
Originally Posted by jab06
In all honesty removing the cat may free up 4 or 5 hp's. Once that cat is removed the check engine light is going to come on and stay on. If I were you I wouldnt bother.
My car sounds like a beast now. So if you want a small HP increase and a deeper, throatier sound, by all means, go ahead and do the Y-pipe.
08-28-2006, 09:01 PM
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Originally Posted by clkal
sorry bud. you are incorrect about the check engine light coming on. I just removed my rear 2 cats AND my 2 foot long resonator. I replaced all that crap with a 3.5" y-pipe. My check engine light has NOT come on and WILL NOT come on as the O2 sensors are attached to the exhaust system WAY in front of what I did. They do NOT measure anything behind them.
My car sounds like a beast now. So if you want a small HP increase and a deeper, throatier sound, by all means, go ahead and do the Y-pipe.
My car sounds like a beast now. So if you want a small HP increase and a deeper, throatier sound, by all means, go ahead and do the Y-pipe.
Did the same thing on my BMW but replaced them all with a 3" race cat. How long did it take for your ECU to readjust itself?
Do you have any pictures?
My resonator is already gone so I'm like halfway there.
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08-29-2006, 01:57 AM
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Custom CLK / 05 E500 4matic / 04 Acura TL <<Daily
Originally Posted by ClkE20
Sounds good but will this make you fail emissions or decrease your backpressure resulting in less torque?
I was gonna said the same thing.
08-29-2006, 09:05 AM
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CLK 320
Originally Posted by ClkE20
Sounds good but will this make you fail emissions or decrease your backpressure resulting in less torque?
As far as backpressure, that's another story... I've seen people gain 5-10hp at the wheels from a cat delete, but if you start messing with the resonator or from the cat back, then you gotta be careful about doing things right. Going straight pipe all the way to the mufflers would sound great (maybe too much for some people though), but you might be shooting yourself in the foot in low-end torque.
A dyno run will always tell the tale though...
08-29-2006, 10:21 AM
#10
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Originally Posted by viguera
I replaced the y-pipe on my 04 Maxima, which cut one one of the cats (the other 2 are on the headers) and I passed emissions with no problems. If the configuration on the CLK is the same, I would imagine that you would pass just the same.
As far as backpressure, that's another story... I've seen people gain 5-10hp at the wheels from a cat delete, but if you start messing with the resonator or from the cat back, then you gotta be careful about doing things right. Going straight pipe all the way to the mufflers would sound great (maybe too much for some people though), but you might be shooting yourself in the foot in low-end torque.
A dyno run will always tell the tale though...
As far as backpressure, that's another story... I've seen people gain 5-10hp at the wheels from a cat delete, but if you start messing with the resonator or from the cat back, then you gotta be careful about doing things right. Going straight pipe all the way to the mufflers would sound great (maybe too much for some people though), but you might be shooting yourself in the foot in low-end torque.
A dyno run will always tell the tale though...
08-29-2006, 02:17 PM
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01' CLK55
Originally Posted by ClkE20
Sounds good but will this make you fail emissions or decrease your backpressure resulting in less torque?
yes, I will lose some backpressure, however, I will gain a little on the top-end.
With a 5.4L V8, i'm not really bothered by losing a little low-end torque....i have plenty to spare =)
but , dayamn! My car sounds F'ing great!!!!!
03-11-2008, 07:58 PM
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clk430
clk430 backpressure problem
guys
I took off the resonator, put a K&N filter,and replaced the muffler with a straight pipe. The result wa a very nice sound ,however, I lost tork and downshifting response.
What should I do. Put the resonator back.
Put the resonator and the muffler.
Take off the secondary cats and keep the resonator.
I also have a supersprint muffler that I had on a golf gti would that create any problems.
thanks
I took off the resonator, put a K&N filter,and replaced the muffler with a straight pipe. The result wa a very nice sound ,however, I lost tork and downshifting response.
What should I do. Put the resonator back.
Put the resonator and the muffler.
Take off the secondary cats and keep the resonator.
I also have a supersprint muffler that I had on a golf gti would that create any problems.
thanks
03-12-2008, 11:42 AM
#14
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guys
I took off the resonator, put a K&N filter,and replaced the muffler with a straight pipe. The result wa a very nice sound ,however, I lost tork and downshifting response.
What should I do. Put the resonator back.
Put the resonator and the muffler.
Take off the secondary cats and keep the resonator.
I also have a supersprint muffler that I had on a golf gti would that create any problems.
thanks
I took off the resonator, put a K&N filter,and replaced the muffler with a straight pipe. The result wa a very nice sound ,however, I lost tork and downshifting response.
What should I do. Put the resonator back.
Put the resonator and the muffler.
Take off the secondary cats and keep the resonator.
I also have a supersprint muffler that I had on a golf gti would that create any problems.
thanks
03-14-2008, 06:20 PM
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03-16-2008, 10:01 PM
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guys
I took off the resonator, put a K&N filter,and replaced the muffler with a straight pipe. The result wa a very nice sound ,however, I lost tork and downshifting response.
What should I do. Put the resonator back.
Put the resonator and the muffler.
Take off the secondary cats and keep the resonator.
I also have a supersprint muffler that I had on a golf gti would that create any problems.
thanks
I took off the resonator, put a K&N filter,and replaced the muffler with a straight pipe. The result wa a very nice sound ,however, I lost tork and downshifting response.
What should I do. Put the resonator back.
Put the resonator and the muffler.
Take off the secondary cats and keep the resonator.
I also have a supersprint muffler that I had on a golf gti would that create any problems.
thanks
I fixed the loss of low end power by getting my ECU done (after the exhaust was finished). I used SpeedtuningUSA, but you could use anyone.
It gave me back the low end power and also gave me the top end.
I also had the redline increased by 500 rpm, shifting is stronger and top speed limiter was removed.
IMHO - I was suprised how much I got from the ECU tune...pretty impressive.
http://www.youtube.com/watch?v=BdiYAA09khk
Last edited by Vabene7; 03-16-2008 at 10:04 PM.
03-17-2008, 12:03 AM
#20
the problem isn't the secondary cats, its the primary cats. aka "header hugger" cats.
If you want to improve performance get a set of high flow magnaflow cats for ALL 4 cats both primary & secondary. THEN you will get decent gains.
Make sure the primaries are metallic core cats, ceramics won't be able to sustain the heat for long periods of time. You can get them on ebay for $114 shipped each, or i'm sure if you got 4 you could get a great deal, maybe get them at cheap as $100 a pop. Labor is the only real major expense.
If you want to improve performance get a set of high flow magnaflow cats for ALL 4 cats both primary & secondary. THEN you will get decent gains.
Make sure the primaries are metallic core cats, ceramics won't be able to sustain the heat for long periods of time. You can get them on ebay for $114 shipped each, or i'm sure if you got 4 you could get a great deal, maybe get them at cheap as $100 a pop. Labor is the only real major expense.
03-17-2008, 05:18 PM
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the problem isn't the secondary cats, its the primary cats. aka "header hugger" cats.
If you want to improve performance get a set of high flow magnaflow cats for ALL 4 cats both primary & secondary. THEN you will get decent gains.
Make sure the primaries are metallic core cats, ceramics won't be able to sustain the heat for long periods of time. You can get them on ebay for $114 shipped each, or i'm sure if you got 4 you could get a great deal, maybe get them at cheap as $100 a pop. Labor is the only real major expense.
If you want to improve performance get a set of high flow magnaflow cats for ALL 4 cats both primary & secondary. THEN you will get decent gains.
Make sure the primaries are metallic core cats, ceramics won't be able to sustain the heat for long periods of time. You can get them on ebay for $114 shipped each, or i'm sure if you got 4 you could get a great deal, maybe get them at cheap as $100 a pop. Labor is the only real major expense.
