Dansk decat pipes
02-19-2019, 10:20 AM
#1
Dansk decat pipes
Hello !!
What do you think about the Dansk decat pipes for a Bischoff Porsche 993 Carrera 2 (1995 model) ?
I wanted to keep the OEM muffler and remove the catalytic converters for more sound & more power !!!
How do you think it will sound ? Will the power increase (with any ECU modifications) ?
The Dansk decat do not have X-pipe, they are straight left-to-right right-to-left pipes. Do you think X-pipe is required ?
Thanks !!
MD355
What do you think about the Dansk decat pipes for a Bischoff Porsche 993 Carrera 2 (1995 model) ?
I wanted to keep the OEM muffler and remove the catalytic converters for more sound & more power !!!
How do you think it will sound ? Will the power increase (with any ECU modifications) ?
The Dansk decat do not have X-pipe, they are straight left-to-right right-to-left pipes. Do you think X-pipe is required ?
Thanks !!
MD355
02-19-2019, 10:30 AM
#2
Rennlist Member
I've never been a fan of the decat sound. You're taking a not-so-great sound (stock mufflers) and just making it louder. Yuk. Perhaps somebody can chime in with some dyno data, but this has never been considered a great route to significant tq or hp.
To improve the sound, you need some sort of muffler mods, like LPMM, Fister, RSR, etc. Sport cats or cat pipe can then be used to increase that sound. I'm currently running LPMM (same as Fister Stage 1) with 100-cell Dansk sport cats, and the sound is everything I've ever wanted.
To improve the sound, you need some sort of muffler mods, like LPMM, Fister, RSR, etc. Sport cats or cat pipe can then be used to increase that sound. I'm currently running LPMM (same as Fister Stage 1) with 100-cell Dansk sport cats, and the sound is everything I've ever wanted.
02-19-2019, 10:37 AM
#3
Intermediate
I've never been a fan of the decat sound. You're taking a not-so-great sound (stock mufflers) and just making it louder. Yuk. Perhaps somebody can chime in with some dyno data, but this has never been considered a great route to significant tq or hp.
To improve the sound, you need some sort of muffler mods, like LPMM, Fister, RSR, etc. Sport cats or cat pipe can then be used to increase that sound. I'm currently running LPMM (same as Fister Stage 1) with 100-cell Dansk sport cats, and the sound is everything I've ever wanted.
To improve the sound, you need some sort of muffler mods, like LPMM, Fister, RSR, etc. Sport cats or cat pipe can then be used to increase that sound. I'm currently running LPMM (same as Fister Stage 1) with 100-cell Dansk sport cats, and the sound is everything I've ever wanted.
02-19-2019, 11:53 AM
#4
I've never been a fan of the decat sound. You're taking a not-so-great sound (stock mufflers) and just making it louder. Yuk. Perhaps somebody can chime in with some dyno data, but this has never been considered a great route to significant tq or hp.
To improve the sound, you need some sort of muffler mods, like LPMM, Fister, RSR, etc. Sport cats or cat pipe can then be used to increase that sound. I'm currently running LPMM (same as Fister Stage 1) with 100-cell Dansk sport cats, and the sound is everything I've ever wanted.
To improve the sound, you need some sort of muffler mods, like LPMM, Fister, RSR, etc. Sport cats or cat pipe can then be used to increase that sound. I'm currently running LPMM (same as Fister Stage 1) with 100-cell Dansk sport cats, and the sound is everything I've ever wanted.
It is the old 400 cell catalysts that over time get clogged and do not allow for maximum performance !!
One guy suggested to cut open the stock catalysts and replace the inside with 200 cell sport catalysts !! My mechanic said, just put straight pipes !! Everyone agrees that without cats the car will pick up some bhp !! The only other mod I have is K&N sports air filter with motorsound drilled box !! Sounds amazing !!
What's your opinion about x-pipe ? Do I need it, or just go with cross flow straight pipes ?
02-19-2019, 12:36 PM
#5
Rennlist Member
The muffler shop guys are correct that our mufflers are very high quality and very free flowing. But that doesn't mean they sound good. I urge you to do some searches, and you'll see that it is unanimous that Ruf / LPMM / Fister mufflers sound far better than stock. It's just a given.
You'll also find that few folks say stock muffs with cat pipes sounds good. Some will find it "ok" but that's very different from good.
And yes you will gain maybe 10 hp with cat pipes, but that's all at high RPMs. At low- to mid-range RPM, some say that you might lose torque due to lack of back pressure. So you spend $250 to get 10 hp at the high end, while making the car sound bad. Is it worth it? Depends on your goals.
Oh, and I could be wrong, but I don't think our stock cats will get "clogged" even after 150k miles. You may want to search on that too.
You'll also find that few folks say stock muffs with cat pipes sounds good. Some will find it "ok" but that's very different from good.
And yes you will gain maybe 10 hp with cat pipes, but that's all at high RPMs. At low- to mid-range RPM, some say that you might lose torque due to lack of back pressure. So you spend $250 to get 10 hp at the high end, while making the car sound bad. Is it worth it? Depends on your goals.
Oh, and I could be wrong, but I don't think our stock cats will get "clogged" even after 150k miles. You may want to search on that too.
02-19-2019, 01:58 PM
#7
Burning Brakes
MD355, I don't know about your car, but I think you certainly picked up some exclamation points 
It's so hard to be objective on what sound is appealing. I haven't heard any FDs live ever, but the recordings I have heard seem a bit off, but everyone else seems to love them.
It's so hard to be objective on what sound is appealing. I haven't heard any FDs live ever, but the recordings I have heard seem a bit off, but everyone else seems to love them.
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02-19-2019, 03:44 PM
#8
Nordschleife Master
I am not convinced you will pick up much HP, maybe ~10, but with free flow exhaust, it is likely that you will get to peak HP a little quicker.
Having switched back and forth several times now, from OEM 400 cell cats and Fabspeed 200 cell cats, I have noticed with the Fabspeeds that my car accelerates to red line just a tad bit faster. As I noted in a separate thread (RS Cams on street) the peak probably doesn't really change, but the time to get to peak feels faster/ there might be a slight mid range bump as well, but to me the most noticeable change was the response time.
FWIW I am using factor Motor sound muffler, not too loud, but a nice healthy rumble with the 200 cell cats. Super cups and Fister IIIs are louder, and also very healthy sounding.
Having switched back and forth several times now, from OEM 400 cell cats and Fabspeed 200 cell cats, I have noticed with the Fabspeeds that my car accelerates to red line just a tad bit faster. As I noted in a separate thread (RS Cams on street) the peak probably doesn't really change, but the time to get to peak feels faster/ there might be a slight mid range bump as well, but to me the most noticeable change was the response time.
FWIW I am using factor Motor sound muffler, not too loud, but a nice healthy rumble with the 200 cell cats. Super cups and Fister IIIs are louder, and also very healthy sounding.
02-19-2019, 05:50 PM
#11
Hello !!
What do you think about the Dansk decat pipes for a Bischoff Porsche 993 Carrera 2 (1995 model) ?
I wanted to keep the OEM muffler and remove the catalytic converters for more sound & more power !!!
How do you think it will sound ? Will the power increase (with any ECU modifications) ?
The Dansk decat do not have X-pipe, they are straight left-to-right right-to-left pipes. Do you think X-pipe is required ?
Thanks !!
MD355
What do you think about the Dansk decat pipes for a Bischoff Porsche 993 Carrera 2 (1995 model) ?
I wanted to keep the OEM muffler and remove the catalytic converters for more sound & more power !!!
How do you think it will sound ? Will the power increase (with any ECU modifications) ?
The Dansk decat do not have X-pipe, they are straight left-to-right right-to-left pipes. Do you think X-pipe is required ?
Thanks !!
MD355
The x gained popular acceptance on V8s which odd fire engines, odd fire means that 2 cylinders on a side fire consecutively, w/o an x this overloads the collector on one side then alternately on the other side. This hurts the performance potential.
a Porsche flat 6 is an even fire engine, there is no consecutive fire into a single collector and no need for an x. When an X is used it has to be very carefully crafted so as to not add turbulence to the flow(this is rarely done). The net effect on our engines is to mitigate noise a little.
02-22-2019, 10:45 AM
#12
Despite all the advertising hype you may have seen that style of cat bypass w/o an x is exactly what you want.
The x gained popular acceptance on V8s which odd fire engines, odd fire means that 2 cylinders on a side fire consecutively, w/o an x this overloads the collector on one side then alternately on the other side. This hurts the performance potential.
a Porsche flat 6 is an even fire engine, there is no consecutive fire into a single collector and no need for an x. When an X is used it has to be very carefully crafted so as to not add turbulence to the flow(this is rarely done). The net effect on our engines is to mitigate noise a little.
The x gained popular acceptance on V8s which odd fire engines, odd fire means that 2 cylinders on a side fire consecutively, w/o an x this overloads the collector on one side then alternately on the other side. This hurts the performance potential.
a Porsche flat 6 is an even fire engine, there is no consecutive fire into a single collector and no need for an x. When an X is used it has to be very carefully crafted so as to not add turbulence to the flow(this is rarely done). The net effect on our engines is to mitigate noise a little.
02-23-2019, 03:13 PM
#13
Here are the firing patterns of several motors
New Chevrolet LS, for efficiency you want to pair 1 & 3, 2 & 4 on the left side and 5 & 7, 6 & 8 on the right side, Or even better use a crossover sending 6 & 4 to the left side and 5 & 3 to the right side
Old Chevrolet 'stovepipe', different f/o but the same odd fire issue, so pair 1 & 5, 3 & 7 on the left and 2 & 4, 6 & 8 on the right, or use a crossover
Honda 4, even fire so no issue but for a better torque curve pair 1 & 3, 2 & 4
Porsche 6, even fire great separation so a smaller collector can be used, no issues,
New Chevrolet LS, for efficiency you want to pair 1 & 3, 2 & 4 on the left side and 5 & 7, 6 & 8 on the right side, Or even better use a crossover sending 6 & 4 to the left side and 5 & 3 to the right side
Old Chevrolet 'stovepipe', different f/o but the same odd fire issue, so pair 1 & 5, 3 & 7 on the left and 2 & 4, 6 & 8 on the right, or use a crossover
Honda 4, even fire so no issue but for a better torque curve pair 1 & 3, 2 & 4
Porsche 6, even fire great separation so a smaller collector can be used, no issues,