We have decided to make a valved and non valved muffler for the 991. Both will be offered with exhaust tips. The valved version has just been completed and we have received our first shipment. Here are all of the details....

VALVED MUFFLER:

+ 11 Hp & + 10 Tq Gain.
- 2 3/4" Tubing (70mm).
- 4 x 3.5"(90mm) Round Tips.
- 38.5 lb. weight savings over OEM mufflers.
- T 316 stainless steel for improved durability over T 304.
- Absolutely NO DRONE in the cabin.
- Does NOT interfere with emissions and will NOT trigger the check engine light.
- ECU programming (software) is NOT NECESSARY.
- Replaces OEM side mufflers and connects to OEM header and catalytic flange.
- Under load (moving) with valves closed: 83dB*
- Under load (moving) with valves open: 89dB*

*OEM muffler is 75 dB with valves closed for reference.

This is the very 1st aftermarket muffler for the 991 and is also one of the most technically advanced mufflers for Porsche® to date. Our muffler incorporates an X pipe design to dampen and eliminate unwanted frequencies otherwise known as “drone” and gives the system the added benefit of increased torque in the mid-range.

The actual muffler is vastly different than the common baffle plated muffles stuffed with packing material that are common in the aftermarket. Ours are uniquely made with double perforated sound absorption tubes. The acoustic silencer absorption tubes are made in a trapezoidal pattern and are perforated with varying diameters, which isolate and dampen unwanted frequencies. Perforated tubes at higher gas velocities, present much less flow restriction than baffle plates and consequently translates into larger horsepower gains at higher RPMs. Also they produce the aggressive gurgling sound and contribute to the low, deep tones that you hear with the exhaust valves open.

The exhaust tips are a dual 3.5” round design and are double walled to dissipate heat, which means that they won’t tarnish as quickly as single walled tips. The design fit’s the factory cut outs in the bumper perfectly and is mounted via a ball style-connecting joint so they can be perfectly adjusted and centered.











Please note: This muffler is a direct replacement the 991 Carrera® S (3.8L - US model) which comes standard with valves. It is also a direct replacement for the Porsche® Sport Exhaust option. For the base 991 Carrera’s® (3.4L – US model) you will also need to order FVD Part # BES KLS 000 001 to compensate for the exhaust valves.

Current Retail Price: $ 4,416.00

 

The non valved mufflers are now in and ready to ship. Here are the details...

NON VALVED MUFFLER:

+ 11 Hp & + 10 Tq Gain.
- 2 3/4" Tubing (70mm).
- 4 x 3.5"(90mm) Round Tips.
- 39 lb. weight savings over OEM mufflers.
- T 316 stainless steel for improved durability over T 304.
- Absolutely NO DRONE in the cabin.
- Does NOT interfere with emissions and will NOT trigger the check engine light.
- ECU programming (software) is NOT NECESSARY.
- 90 dB maximum (OEM muffler is 75 dB for reference).
- Replaces OEM side mufflers and connects to OEM header and catalytic flange.

Please note: This muffler does not include exhaust valves and is meant to replace the OEM system on the base 3.4L 991 (2012+).











Current Retail Price: $ 3,043.00

 

These retain the side mufflers? I have PSE on my 991 will it stil function as OME? Can you recommend installer in Portland? And does this system trigger engine light ?? Thanks Ross

 

No, this set up does not retain the side mufflers.

Yes, you will have the full functionality of your PSE with our valved set up.

I would highly recommend Rothsport Racing, speak to Jeff Gamroth the owner. They are in Tulatin, just south of Portland.

This system will not trigger a check engine light.

Thanks,
Rhonda

 

I have the 991S without sport exhaust but would like to retrofit the "button" to control the valves. Is this possible? Can you recommend an installer in NJ or CT? Also, can you PM me updated pricing?

Thanks,

John

 

Any installers in SE Michigan?

 

Sure. Are you close to Troy? Or a bit more south like Ann Arbor or Monroe?

 

Troy

 

I suggest
Gilson Motorsports
1208 E. Maple Rd.
Troy, MI 48083
248-549-4016

 

How are the valves activated on a non PSE S?

 

The valves are controlled via RPM load just like your current OEM exhaust.