a quick Q
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2nd Gear
Joined: Jan 2008
Posts: 737
From: Upstate NY
a quick Q
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im not very familiar with exhaustas you can tell but what is the difference between a catless downpipe, and a stock catted downpipe that had the material cleared out of it?
im not very familiar with exhaustas you can tell but what is the difference between a catless downpipe, and a stock catted downpipe that had the material cleared out of it?
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Joined: Jul 2006
Posts: 11,670
From: Binghamton, NY
The main difference is that a catless DP is likely to be a consistent diameter all the way from end to end. A gutted DP that contained a cat will probably have an enlarged center section where the catalyst is. When you gut that out, you may create a little turbulence and thus some backpressure. The airflow through the catless DP is smooth - the volume/cross-section of the pipe is consistent from end to end, so nothing really affects the flow speed of the air through it. On the gutted DP, exhaust air is flowing at a given velocity/pressure until it hits the larger-diameter "cat" section. There, the pipe widens, so pressure and/or velocity drop. At the opposite end of the "cat" section, the pipe narrows, and the airflow characteristics change again.
Overall, on a street car, you probably won't notice the effects of one over the other - maybe with the catless DP you'd see a little quicker spool off of an upgraded turbo, but chances are either one would be transparent. The bigger you go in turbo size and HP output, the more these things will likely matter. For now though, I don't think one will give you any advantage over the other.
Overall, on a street car, you probably won't notice the effects of one over the other - maybe with the catless DP you'd see a little quicker spool off of an upgraded turbo, but chances are either one would be transparent. The bigger you go in turbo size and HP output, the more these things will likely matter. For now though, I don't think one will give you any advantage over the other.
The main difference is that a catless DP is likely to be a consistent diameter all the way from end to end. A gutted DP that contained a cat will probably have an enlarged center section where the catalyst is. When you gut that out, you may create a little turbulence and thus some backpressure. The airflow through the catless DP is smooth - the volume/cross-section of the pipe is consistent from end to end, so nothing really affects the flow speed of the air through it. On the gutted DP, exhaust air is flowing at a given velocity/pressure until it hits the larger-diameter "cat" section. There, the pipe widens, so pressure and/or velocity drop. At the opposite end of the "cat" section, the pipe narrows, and the airflow characteristics change again.
Overall, on a street car, you probably won't notice the effects of one over the other - maybe with the catless DP you'd see a little quicker spool off of an upgraded turbo, but chances are either one would be transparent. The bigger you go in turbo size and HP output, the more these things will likely matter. For now though, I don't think one will give you any advantage over the other.
Overall, on a street car, you probably won't notice the effects of one over the other - maybe with the catless DP you'd see a little quicker spool off of an upgraded turbo, but chances are either one would be transparent. The bigger you go in turbo size and HP output, the more these things will likely matter. For now though, I don't think one will give you any advantage over the other.
Dang that sounded down right official, almost like you knew what you were talkin about lol ;-)
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