Exhaust Advise
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Joined: May 2001
Posts: 2,648
Likes: 497
From: NH
Reading this thread, I thought that I should chime in. We produce a full 3" X-Pipe exhaust that does not drone. I run it on my personal 991.2TT and I have never detected any drone and I am very sensitive to drone. Additionally, I have been told by numerous customers (many are members here) that our SpeedTech 991TT 3.0 Level 6 system does not drone at all. If anyone would like to discuss a drone free 3.0 system with glorious sound characteristics, feel free to contact me. I have exrtensive seat time with all of our systems, including our very special 991.2 "GT2 style" valved system with switched cat dump pipes.
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992.2 Turbo S Ice Grey Metallic (incoming July '26) https://porsche-code.com/PTE3HVU3
992.1 GT3 GT Silver
991.2 GT3 RS Weissach Racing Yellow
991.2 Turbo S GT Silver (leaving soon)
991.2 GT3 Chalk (Manual)
2022 Cayenne White
former 1972 911T white, 1984 911 3.2 Targa black, 993 cab white, 993TT arena red, 993TT silver, 996TT speed yellow, 991.1 GT3 white
www.speedtechexhausts.com
info@speedtechexhausts.com
Testimonials SpeedTech Exhaust Videos facebook
992.2 Turbo S Ice Grey Metallic (incoming July '26) https://porsche-code.com/PTE3HVU3
992.1 GT3 GT Silver
991.2 GT3 RS Weissach Racing Yellow
991.2 Turbo S GT Silver (leaving soon)
991.2 GT3 Chalk (Manual)
2022 Cayenne White
former 1972 911T white, 1984 911 3.2 Targa black, 993 cab white, 993TT arena red, 993TT silver, 996TT speed yellow, 991.1 GT3 white
www.speedtechexhausts.com
info@speedtechexhausts.com
Testimonials SpeedTech Exhaust Videos facebook
Race Car
Joined: Jan 2019
Posts: 3,782
Likes: 1,310
Reading this thread, I thought that I should chime in. We produce a full 3" X-Pipe exhaust that does not drone. I run it on my personal 991.2TT and I have never detected any drone and I am very sensitive to drone. Additionally, I have been told by numerous customers (many are members here) that our SpeedTech 991TT 3.0 Level 6 system does not drone at all. If anyone would like to discuss a drone free 3.0 system with glorious sound characteristics, feel free to contact me. I have exrtensive seat time with all of our systems, including our very special 991.2 "GT2 style" valved system with switched cat dump pipes.
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Joined: May 2001
Posts: 2,648
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From: NH
100 cell HJS cats. Plenty of turbo whistle, no drone, great sound. A lot of it has to do with the overall exhaust design. I have been building and testing X-Pipe exhausts for Porsche turbos since the 996TT and have R&D'ed them all with the goal of obtaining the best sound characteristics and eliminating drone by varying the design parameters (in fact, when we made and introduced our 1st 996TT X-Pipe back around 2008, there were no other X-Pipes on the market for the Porsche turbo, now virtually all manufacturers have gone to it). Not all X-Pipes sound the same, small variances in the design affect the final sound characteristics and we have learned a lot about this over the years of product development.
Race Car
Joined: Jan 2019
Posts: 3,782
Likes: 1,310
100 cell HJS cats. Plenty of turbo whistle, no drone, great sound. A lot of it has to do with the overall exhaust design. I have been building and testing X-Pipe exhausts for Porsche turbos since the 996TT and have R&D'ed them all with the goal of obtaining the best sound characteristics and eliminating drone by varying the design parameters (in fact, when we made and introduced our 1st 996TT X-Pipe back around 2008, there were no other X-Pipes on the market for the Porsche turbo, now virtually all manufacturers have gone to it). Not all X-Pipes sound the same, small variances in the design affect the final sound characteristics and we have learned a lot about this over the years of product development.
Burning Brakes
Joined: Jan 2021
Posts: 1,153
Likes: 477
I'm running this exact setup from Speedtech and it's great. No drone and can take the wife and pups to a long drive and be totally fine.
Open it up in sports or sport + mode and it's super commanding. Both performance and sound.
Open it up in sports or sport + mode and it's super commanding. Both performance and sound.
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Joined: Mar 2014
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From: SW Florida
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From: US
100 cell HJS cats. Plenty of turbo whistle, no drone, great sound. A lot of it has to do with the overall exhaust design. I have been building and testing X-Pipe exhausts for Porsche turbos since the 996TT and have R&D'ed them all with the goal of obtaining the best sound characteristics and eliminating drone by varying the design parameters (in fact, when we made and introduced our 1st 996TT X-Pipe back around 2008, there were no other X-Pipes on the market for the Porsche turbo, now virtually all manufacturers have gone to it). Not all X-Pipes sound the same, small variances in the design affect the final sound characteristics and we have learned a lot about this over the years of product development.
Racer
Joined: Jul 2015
Posts: 353
Likes: 35
From: Cleveland OH
Soul x-pipe, cat bypass, Kline headers:
https://youtu.be/mbeRyGIHE60?si=oFafA378d5Xr5ZXY
Another clip of the same setup as above. This is before I tuned out the excessive burbles and pops. It sounds fine in this particular clip, but the decel 'pops' sort of became decel 'BANGS' that were way to loud for me.
https://youtu.be/4EaA3fSLt84?si=tBA6XiH-kBGw_s41
https://youtu.be/mbeRyGIHE60?si=oFafA378d5Xr5ZXY
Another clip of the same setup as above. This is before I tuned out the excessive burbles and pops. It sounds fine in this particular clip, but the decel 'pops' sort of became decel 'BANGS' that were way to loud for me.
https://youtu.be/4EaA3fSLt84?si=tBA6XiH-kBGw_s41
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Joined: May 2001
Posts: 2,648
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From: NH
I've either installed and/or experienced quite a few 996/997/991 Turbo exhausts including Soul, Kline, Europipe, Fabspeed, Topspeed, Akropovic, Sharkwerks, Markski, Unobtanium and I'm sure a few others I've forgotten, but haven't personally installed or heard any of John's SpeedTech exhausts. I'd like to rectify that someday...
I have personally experienced all of the above except unobtanium (and I think I have a pretty good idea of how it sounds by looking at it). Each have their unique sound. I feel confident that you would be extremely pleased with a SpeedTech.
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Joined: Nov 2004
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From: DFW Texas
I have the SpeedTech exhaust on my Turbo S. It's the 2.5" no muffler, with factory cats. Very quiet when cruising with no drone, but open it up and it really roars. Perfect for what I wanted and I'm very happy with my choice.
I also have the Kline SS headers but I really don't think they make any difference in the sound.
I also have the Kline SS headers but I really don't think they make any difference in the sound.
Last edited by Jim M.; Jan 12, 2025 at 12:29 PM.
Burning Brakes
Joined: Apr 2023
Posts: 1,236
Likes: 713
From: Annapolis, MD US
I have the SpeedTech exhaust on my Turbo S. It's the 2.5" no muffler, with factory cats. Very quiet when cruising with no drone, but open it up and it really roars. Perfect for what I wanted and I'm very happy with my choice.
I also have the Kline SS headers but I really don't think they make any difference in the sound.
I also have the Kline SS headers but I really don't think they make any difference in the sound.
Advanced
Joined: Mar 2005
Posts: 94
Likes: 37
From: Franklin, TX
In all the 991 Turbo exhaust permutations I tried, I found that a cat bypass was the critical element to getting the sound I wanted. After six permutations, I settled on Soul x-pipe, cat bypass, Kline headers. Throaty, exotic, but with little or no drone and reasonable volume, though I did have to have my tuner (Sam) dial back the throttle-cut burbles and pops. I never tried a 3" inconel on this particular car.
I'm also considerring adding quarter wave pipes to target the 1800-2200 rmp drone.
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Joined: Mar 2005
Posts: 94
Likes: 37
From: Franklin, TX
I just got curious and went and measured my Soul Comp Xpipe and deletes. The OD measures 3". I had been led to believe the Soul was more restrive than Kline. Not sure why. There are a few neckdowns where the pipes join. Could be the reason.
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Joined: Jul 2021
Posts: 1,401
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From: Murfreesboro, TN
I have Sam's stage 5 turbos, and Sould comp X pipe with cat delete. Would you attempt to descrip the difference between this set up with stock headers and the Kline? I'll have to ask Sam about reducing my pops. It damn near shotgun loud now. I like them but would like something between what I have now and what yours is in ther video.
I'm also considerring adding quarter wave pipes to target the 1800-2200 rmp drone.
I'm also considerring adding quarter wave pipes to target the 1800-2200 rmp drone.