991.2 GT3 Touring Products

Dundon Street (Catted) tuned length headers and valved side delete exhaust system for the 991.2 GT3! We were able to keep all of the things that people love about our race headers:

• less weight
• more power,
• great sound,
• quiet when you want it to be
• no drone
• lifetime structural warranty
• 100% 30day money back guarantee

• if you try it and don't like it, send it back we'll give you your money back!

We use 321SS (a superior grade of Stainless steel to the cheaper 304SS) and use a metal core spiral wound 200CPSI catalytic converter. All our products are mfg in the USA in our shop in Gig Harbor, WA.

By routing the primaries up and positioning the catalytic converter more vertical we were able to retain 99% of the primary length of the race system. This is how we are able to achieve 25whp gains on the 991.2 GT3.

The Dundon Street Headers on 991.2 GT3

477 whp Peak 

20-25whp gains at 8200-8500 rpm

40lbft-46lbft gains at 3000-5000 rpm

You get everything you love about the Dundon Race Headers, 321 SS construction, industry leading power, lifetime structural warranty, and 100% money back guarantee, if you try it and don't like it, send it back we'll give you your money back! To that end, see the dyno below!

991.2 GT3 Dundon Street (Catted) 477whp peak 

Some pics installed on the car, the street headers are only about 0.5" shorter than our race headers. To fit everything we had to go up into the wheel well where the side mufflers sit. Only way to get the length required for real power gains...  

Dundon 991 GT3/RS showing length of primaries and routing required to fit the cat

As you can see to get the length we wanted we had to go up, anything that can bolt up to the stock location is leaving power on the table...  

Take a listen to it here!

Dundon 991.2 GT3 and GT3RS Street Header-Loud Muffler Sound Check

Can be used with Dundon cat backs, 3" side deletes, or added to our Street Header package to give you the ultimate in Performance and Sound improvements. Will turn a beautiful shade of blue when driven hard!

Most of us have experienced the many issues associated with both the stock Steel and Ti rear mufflers on our beloved 991.2 GT3RS. cracking, holes, not passing sound etc...  We've been reinforcing both the Steel and Ti versions for years after they crack and understand why they fail quite well.  We set out to fix the weakness of the OEM center muffler and include an option for those that want their car to pass the more and more prevalent dB restricted tracks without losing power.  We finalized the design and have tested at numerous tracks both for longevity and for dB reduction.

We're happy to announce our GT3RS Lifetime Center Muffler.  It's available in 2 "flavors" Quiet and Loud.  The Quiet is for those customers looking for no drone* while cruising and to quiet the car at full boogie to attenuate some of the dB levels on the track or on the street.  The Loud is the muffler for those looking for no drone* at cruise, but a pronounced bark when getting on it!

We've tested the Quiet on a 991 GT3s with side muffler deletes that was 104dB before the muffler and passing a 90dB day after .  We've tested on a stock 991 GT3RS and the car passed where it hadn't previously. And we tested on a 997.2 GT3 that had not passed at Laguna and passed a 90dB day.  We've recorded the Orange GT3 Center Muffler in our own testing at 10-12dB reduction over the OEM GT3 Muffler.  All of the testing was done on cars WITHOUT GPS Exhaust flap closing devices.

• Lifetime Guaranteed including track use.
• 321 Stainless Steel coupled with a high strength design.
• Quiet has no power loss (up to 450whp engines), sounds great and reduces sound levels 10-12dB over stock.
• Loud less restriction on higher powered cars (>450whp) and wicked flat six waiil!
• 4" rolled exhaust tips in PVD Black are Standard.  Titanium Tips are optional!  Add our Nurburgring Quiet Tips to further quiet your car down!
• Direct replacement of the OEM muffler, will fit existing modification if they work with the OEM Center Muffler.
• OEM 63mm or 3" lower inlet sizing for increased flow.

* for no drone performance, the cars must maintain valves and use both the upper and lower exhaust paths in the muffler.

Available in OEM lower flow tube size for stock muffler or 3" lower flow tube size for use with Dundon Lifetime Mufflers

3" Lower Flow Path Offers

• 44% improvement in flow over stock
• 20% reduction in pressure drop over stock
• Use with Loud Muffler to have a bulletproof light weight track setup, with no drone

Use with Quiet Muffler to have a bulletproof light weight track setup for dB restricted tracks!

Replacement tip sets for your Dundon Lifetime Muffler ONLY. Does NOT fit OE Porsche Mufflers. Proper tip length is important, so please ensure you select the correct application.