X Pipe question - Odor & Power
05-29-2017, 12:44 AM
#16
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Reply...
"Can anyone who's run both the 200 cell and cat bypass pipes comment On a difference in sound? Are the cat less pipes louder than the high flow cat pipes?"
My ear tells me that the 993 with 200 cell cats and sport mufflers, on a scale of 1 to 10, and 1 being super quiet, with 10 being raucous, the car with sport mufflers and cat bypass is an 9 under acceleration....be gentle with the throttle and the car is fairly tame.
The car with the 200 cell cats and sport mufflers is 6....on my personal scale.
My experience? I started with B&B, went to Motorsound, then to the RSR muffs, several iterations of FD Motorsports...then to Fabspeed cross over/under cat bypass pipes with ??? mufflers, then to Maxflows with 200 cell cars and Fabspeed X pipe...then replaced the 200 cell with Fabspeed Cat delete....and finally, went back to stock muffs and a stock cat...why back to stock? To pass bi-aanual emissions testing and annual 91 dB sound at Laguna Seca.
Take a long trip with cat delete, you'll need your hearing checked when you get back home. I drove from San Diego to San Jose with cat delete cross over pipes, planned for it, took along a set of BOSE noise canceling headphone...this really happened.
Stock is tame, but it works for me.
My ear tells me that the 993 with 200 cell cats and sport mufflers, on a scale of 1 to 10, and 1 being super quiet, with 10 being raucous, the car with sport mufflers and cat bypass is an 9 under acceleration....be gentle with the throttle and the car is fairly tame.
The car with the 200 cell cats and sport mufflers is 6....on my personal scale.
My experience? I started with B&B, went to Motorsound, then to the RSR muffs, several iterations of FD Motorsports...then to Fabspeed cross over/under cat bypass pipes with ??? mufflers, then to Maxflows with 200 cell cars and Fabspeed X pipe...then replaced the 200 cell with Fabspeed Cat delete....and finally, went back to stock muffs and a stock cat...why back to stock? To pass bi-aanual emissions testing and annual 91 dB sound at Laguna Seca.
Take a long trip with cat delete, you'll need your hearing checked when you get back home. I drove from San Diego to San Jose with cat delete cross over pipes, planned for it, took along a set of BOSE noise canceling headphone...this really happened.
Stock is tame, but it works for me.
Last edited by Martin S.; 05-31-2017 at 11:03 AM. Reason: Correct Typos
05-31-2017, 01:00 AM
#18
Rennlist Member
2) x pipe- IF properly designed it's possible o see increased performance but that's a big if
The primary benefit of an x connection is noise control
Note that most of the X pipe myth has been translated from V8 experience where the exhaust flow is very different due to the odd fire configuration of most V8s as compared to the even fine architecture of a flat 6
The other factor in a 911 is that the only way to fit an X-pipe - well, at least the popular way - has the exhaust from each bank basically ramming into each other. Not conducive to good flow.
05-31-2017, 01:45 PM
#19
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Even had a very well respected exhaust fabricator tell me, x-pipes on flat sixes are counter productive. With their small cross sections (maybe a couple of inches, if that) make it easy to feel they are restrictive.
05-31-2017, 05:56 PM
#20
"Can anyone who's run both the 200 cell and cat bypass pipes comment On a difference in sound? Are the cat less pipes louder than the high flow cat pipes?"
My ear tells me that the 993 with 200 cell cats and sport mufflers, on a scale of 1 to 10, and 1 being super quiet, with 10 being raucous, the car with sport mufflers and cat bypass is an 9 under acceleration....be gentle with the throttle and the car is fairly tame.
The car with the 200 cell cats and sport mufflers is 6....on my personal scale.
My experience? I started with B&B, went to Motorsound, then to the RSR muffs, several iterations of FD Motorsports...then to Fabspeed cross over/under cat bypass pipes with ??? mufflers, then to Maxflows with 200 cell cars and Fabspeed X pipe...then replaced the 200 cell with Fabspeed Cat delete....and finally, went back to stock muffs and a stock cat...why back to stock? To pass bi-aanual emissions testing and annual 91 dB sound at Laguna Seca.
Take a long trip with cat delete, you'll need your hearing checked when you get back home. I drove from San Diego to San Jose with cat delete cross over pipes, planned for it, took along a set of BOSE noise canceling headphone...this really happened.
Stock is tame, but it works for me.
My ear tells me that the 993 with 200 cell cats and sport mufflers, on a scale of 1 to 10, and 1 being super quiet, with 10 being raucous, the car with sport mufflers and cat bypass is an 9 under acceleration....be gentle with the throttle and the car is fairly tame.
The car with the 200 cell cats and sport mufflers is 6....on my personal scale.
My experience? I started with B&B, went to Motorsound, then to the RSR muffs, several iterations of FD Motorsports...then to Fabspeed cross over/under cat bypass pipes with ??? mufflers, then to Maxflows with 200 cell cars and Fabspeed X pipe...then replaced the 200 cell with Fabspeed Cat delete....and finally, went back to stock muffs and a stock cat...why back to stock? To pass bi-aanual emissions testing and annual 91 dB sound at Laguna Seca.
Take a long trip with cat delete, you'll need your hearing checked when you get back home. I drove from San Diego to San Jose with cat delete cross over pipes, planned for it, took along a set of BOSE noise canceling headphone...this really happened.
Stock is tame, but it works for me.
06-05-2017, 07:42 PM
#21
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I know there are lots of threads about this but I can't find an answer.
Please keep in mind my tolerance level is quite high. I know it's going to be loud with my Maxflo but that's what I'm looking for.
I also know it will smell bad. I am ok with a smell at start up... but I have a cab, and sometimes there is traffic on my way to work.
2 questions :
1- will the odor ruin my driving experience?
2- I am looking at a cat bypass x pipe home made. Does just replacing by an x pipe increase power?
BTW if you have something to sell, contact me!
Please keep in mind my tolerance level is quite high. I know it's going to be loud with my Maxflo but that's what I'm looking for.
I also know it will smell bad. I am ok with a smell at start up... but I have a cab, and sometimes there is traffic on my way to work.
2 questions :
1- will the odor ruin my driving experience?
2- I am looking at a cat bypass x pipe home made. Does just replacing by an x pipe increase power?
BTW if you have something to sell, contact me!
Here's some feedback from the Pelican 964/993 Forum. http://forums.pelicanparts.com/porsc...at-bypass.html
The beauty of the Fabspeed X pipe is that you can easily switch back and forth from sport cats to a cat delete pipe.
The beauty of the Fabspeed X pipe is that you can easily switch back and forth from sport cats to a cat delete pipe.
Smell that? You smell that?
Lance: What?
Kilgore: Hydrocarbons, son. Nothing else in the world smells like that.
[kneels]
Kilgore: I love the smell of hydrocarbons in the morning. You know, one time we had a track day, for 12 hours. When it was all over, I walked up. We didn't find one of 'em, not one stinkin' catalytic converter. The smell, you know that gasoline exhaust smell, the whole track. Smelled like
[sniffing, pondering]
Kilgore: Victory!
Lance: What?
Kilgore: Hydrocarbons, son. Nothing else in the world smells like that.
[kneels]
Kilgore: I love the smell of hydrocarbons in the morning. You know, one time we had a track day, for 12 hours. When it was all over, I walked up. We didn't find one of 'em, not one stinkin' catalytic converter. The smell, you know that gasoline exhaust smell, the whole track. Smelled like
[sniffing, pondering]
Kilgore: Victory!
__________________
Porsche Performance Specialist
John@Fabspeed.com
215-618-9796
Fabspeed Motorsport USA
155 Commerce Drive Fort Washington, PA 19034
www.Fabspeed.com
Porsche Performance Specialist
John@Fabspeed.com
215-618-9796
Fabspeed Motorsport USA
155 Commerce Drive Fort Washington, PA 19034
www.Fabspeed.com
06-05-2017, 09:26 PM
#22
Agent Orange
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FWIW on my current project I decided against the X-pipe. I've spoken with several tuners and exhaust manufacturers and the consensus is that with Porsche has designed a very good exhaust flow system on the 993, out of the box. So I bought a Dansk 100 cell sport cat which uses the same architecture as the OEM cat, but without the restrictions due to emissions.
06-05-2017, 09:39 PM
#23
Official Wednesday AM Red Bull F1 test driver
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Love the sound with the Fabspeed pipe on our '97 coupe. Smell doesn't really bother me but I've been driving a 914 for 45+ years that never had a cat so guess I'm used to it... for some reason I seem to notice the smell more on my son's Cayman S with cat-deletes.