Fabspeed headers vs. maxflo side mufflers
Thread Starter
Rennlist Member
Joined: May 2013
Posts: 52
Likes: 1
Want to enhance sound to my CS leaving PSE intact, I'd like to know what would be better to mod, the headers or side mufflers? I though of Fabspeed.
Any of these options would be accompanied with their comp intake.
I've read in different threads most people goes for the side mufflers, some others for the headers, don't know which of these options would be better for increasing sound. Performance will be nice if I can improve it, but not my main concern.
Any of these options would be accompanied with their comp intake.
I've read in different threads most people goes for the side mufflers, some others for the headers, don't know which of these options would be better for increasing sound. Performance will be nice if I can improve it, but not my main concern.
Last edited by dr bit; Jul 14, 2013 at 11:10 PM.
Former Vendor
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https://rennlist.com/forums/991/7430...r-install.html
My vote is for side mufflers first. Although, headers have been recently updated for even more power gains.
My vote is for side mufflers first. Although, headers have been recently updated for even more power gains.
Burning Brakes
Joined: Jan 2012
Posts: 821
Likes: 6
From: Pacific NW
I have the maxflo side mufflers and ceramic black tips done with Fabspeed, keeping the PSE main muffler and X-pipe intact - and love it. I would go for the headers also but frankly the wife asked me to wait and see how I like the mufflers first. I've done two cars with Fabspeed mufflers, one a 997.2 PDK and this manual, and both have had zero drone or any other issues. Both have worked very well.
If I do decide to up the ante with "sport" headers also, I hope they would be legal in California etc, and that another 991 owner or someone could verify the Headers would not interfere or cause issues with Check-Engine lights, etc. As I understand from reading the Fabspeed 991 section on their website, their sport headers with 200 cell cats are not legal for regular street use in California. Please correct me if I'm wrong but that is also holding me back on ordering them. I don't live in California but I drive through and don't want any troubles.
Here are some of my sound vids with the maxflo secondary mufflers matched with the PSE. I'd love to hear a 991 video with the headers on as well.
Good luck!
If I do decide to up the ante with "sport" headers also, I hope they would be legal in California etc, and that another 991 owner or someone could verify the Headers would not interfere or cause issues with Check-Engine lights, etc. As I understand from reading the Fabspeed 991 section on their website, their sport headers with 200 cell cats are not legal for regular street use in California. Please correct me if I'm wrong but that is also holding me back on ordering them. I don't live in California but I drive through and don't want any troubles.
Here are some of my sound vids with the maxflo secondary mufflers matched with the PSE. I'd love to hear a 991 video with the headers on as well.
Good luck!
Last edited by Nicoli35; Jul 18, 2013 at 01:05 PM.
Former Vendor
Joined: Dec 2012
Posts: 351
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Here's a dyno chart for our 200 Cell Sport Headers on a 991 C4 non S. Very impressive gains throughout the rpm range. 22-27 ft. lbs. torque to the wheels gain at 3,000 rpm and 15-20 whp gains throughout the rpm range. Peak HP is up 5 and peak torque up 9.
The gains with our X-pipe are silly in the mid range, especially for a normally aspirated car. Huge torque gains, will post that dyno chart below.
The gains with our X-pipe are silly in the mid range, especially for a normally aspirated car. Huge torque gains, will post that dyno chart below.
Former Vendor
Joined: Dec 2012
Posts: 351
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Here is the graph of our 200 cell Sportcat Headers with X-pipe. Like I said above, stupid gains in the mid range for a non turbo car - brought the power very close to 2wd 3.8S levels on this 4wd 3.4 liter non S car. At 4100, we saw 40+ hp to the wheels and OVER 50 ft.lbs torque gain to the wheels.
Rennlist Member
Joined: Oct 2002
Posts: 26,155
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From: S.F Bay Area
Want to enhance sound to my CS leaving PSE intact, I'd like to know what would be better to mod, the headers or side mufflers? I though of Fabspeed.
Any of these options would be accompanied with their comp intake.
I've read in different threads most people goes for the side mufflers, some others for the headers, don't know which of these options would be better for increasing sound. Performance will be nice if I can improve it, but not my main concern.
Any of these options would be accompanied with their comp intake.
I've read in different threads most people goes for the side mufflers, some others for the headers, don't know which of these options would be better for increasing sound. Performance will be nice if I can improve it, but not my main concern.
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