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Project: 997/991 GT3 exhaust on 911 3.2

Hi all,

Since discovering that it's possible to install a 997/991 GT3 exhaust on my 87 911 3.2, I've been searching for a solution and wanted to document the project here.

After searching the forums I've found many examples of custom headers build to match the GT3 muffler. After a bit of emailing with Brian from Rarelyl8 I learned that he was working on a set of active headers that's using a vacuum valve to switch between the primary and secondary input on the muffler. I was sold.

Below is the headers (with heat) from Brian, and a 991 GT3 muffler coated at PerformanceCoastings in their special "Porsche Grey" ceramic Chromex coating

A few photos:






The set is getting installed this week, and I'll be following up with more photos and videos.

/k

Old 10-19-2020, 10:27 PM
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Nice


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Old 10-20-2020, 02:05 AM
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I was thinking about doing the same thing on me ‘88 Carrera. Just happen to have both 997 and 991 center mufflers. Do you know if they make it without heat too? Will be following to see how it comes out and your impressions.
Old 10-20-2020, 05:44 AM
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very nice. Can't wait for a sound clip.
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Old 10-20-2020, 07:19 AM
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Beautiful, how will you run the open/close solenoids (assuming thats' what they are)? Remote?
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Old 10-20-2020, 07:31 AM
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This look awesome, let's hope Brian has plans for move those headers into production as that's exactly what I'm after for my 3.2. Can't wait for the updates, be interesting to see the differences in weight too.
Old 10-20-2020, 07:32 AM
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Beautiful exhaust. Can't wait to see it installed and hear a sound clip.
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Old 10-20-2020, 07:32 AM
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Will the muffler require a modification to the rear valance too?
Old 10-20-2020, 07:53 AM
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Quote:
Originally Posted by GaryR View Post
Beautiful, how will you run the open/close solenoids (assuming thats' what they are)? Remote?
Being "active" im guessing you open and close the valve with your right foot.
Old 10-20-2020, 08:00 AM
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Whoa...
How much does that setup weigh ?
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Old 10-20-2020, 08:09 AM
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Quote:
Originally Posted by GaryR View Post
Beautiful, how will you run the open/close solenoids (assuming thats' what they are)? Remote?
Well, mine opens with no vaccum, with vaccum they shut. As such mine is shut at idle and opens on acceleration (my vaccum connect to the front of the throttle body on my SC). No vaccum connection and the muffler bypass is open. I just have the active sport cat though.

Like it a lot.
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Old 10-20-2020, 08:27 AM
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Looks heavy and complicated.
Old 10-20-2020, 08:30 AM
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We've had our long tube headers in production for about a year now and are finding new and creative applications for them all the time.
These 997GT3 back box conversions are neat systems, we've done several now. I really like active exhausts and have developed our own active mufflers for several applications. The 997GT3 muffler sounds a bit better than the 991 version. The titanium version is crazy light which is always a plus. The system as a whole is not overly heavy and it looks more complicated than it is. The valve system is simple, they open when the engine is under load. Electronic controls can be added of course.
Tailpipes do require a valance mod. We make fiberglass units for this purpose.


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Old 10-20-2020, 10:14 AM
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