Pre-ownedExhaust
Pre-Owned 991 GT3/RS Long Tube Street Header Exhaust System
Rated 5.0 out of 5,Listed for991.2 · 991.1GT3, GT3 Touring, GT3 RS
Sale price$7,205
Regular price
$8,338.50
−14% · Sale
You save $1,133.50 · ends Nov 30
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Welded parts (mufflers, headers) usually ship in about 7 business days. We call you if that changes.
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30-day Dundon GuaranteeLove it or send it back within 30 days.
Dundon Motorsports stands behind our products with a 30-day love-it guarantee. We are confident in the quality and performance of our upgrades, but if for any reason they don't meet your standards or help you push your performance on track, you can send them back within 30 days.
Overview
Pre-owned header system. Inspected and ready to install. Expect heat discoloration and light cosmetic wear from use.
Pre-Owned Header System for 991.1 and 991.2 GT3, GT3RS, 911R and GT3 Touring. 2.5" Outlets are for use with Stock Muffler and 3.0" Outlets are for use with Dundon Mufflers.
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!
- Convertible to no cats with the swappable test pipes for track days (available separately).
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, 30whp gains on the 991.1 GT3 and 32whp on the 991.1GT3RS. This is the most power from a catted 991.2 GT3, 991.1 GT3 Exhaust, 991.1 GT3RS Exhaust or 911R Exhaust system.
The Dundon Street Headers on 991.2 GT3
477whp 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
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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...
Specs
- Part numbers
- 2.5" Outlet (For use with OEM muffler) 100-40003
- 3.0" Outlet (For use with Dundon Muffler) 100-40002
- Brand
- Dundon Motorsports
- Listed for
- 991.2, 991.1 · GT3, GT3 Touring, GT3 RS
- Condition
- Pre-owned
What owners say
450+ independent reviews
Average 5.0 out of 5. Average from verified buyers, collected by Loox.
Recent reviews from other Dundon owners
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Rated 5 out of 5. Verified buyer
Installed the Dundon Street Header and Crack Pipe combo on my 2016 GT3 RS, and I couldn’t be happier with the results. The sound is absolutely incredible! It completely transforms the car and gives it that raw, aggressive, high-pitched race car sound that the 4.0L flat-six deserves. The way this...
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Rated 5 out of 5. Verified buyer
Great quality, fit and finish is fantastic, instructions were very thorough. Installed on 991.2 GT3 Cup, raced it the next day and everything held up wonderfully!
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Rated 5 out of 5. Verified buyer
Thank you Charles, Jamie, Ted and the crew at Dundon for taking such great care of me and your customers. You guys are a class act and have always gone above and beyond. Much appreciated! Nick