Fabspeed Valvetronic GT3 Muffler Conversion Kit for 981 Porsche Boxster Spyder & Cayman GT4

Fabspeed Valvetronic GT3 Muffler Conversion Kit for 981 Porsche Boxster Spyder & Cayman GT4

Porsche Boxster and Cayman owners have long requested a conversion kit that allows the installation of an OEM 991 GT3-style center muffler onto their vehicles. Fabspeed Motorsport responded by designing a lightweight installation kit, built in-house, that enables any 6-speed Porsche 981 GT4 or Spyder owner to install an OEM GT3 center muffler. This kit also supports the installation of the Fabspeed 991 GT3 Center Muffler Bypass Pipe or GT3 Center Mini Maxflo Performance Exhaust. Additionally, Fabspeed offers its own GT3 universal high-performance muffler, which is stronger and delivers more power than the OEM Porsche GT3 center muffler. The system includes 2.5″ CNC mandrel-bent, one-piece left and right over-axle pipes, along with clamps. The kit also features valved side muffler inlet Y-pipes that retain the factory PSE exhaust functionality, using OEM Porsche GT3 HELICAL aerospace-quality valves imported from Helical Great Britain. The lightweight, stainless steel mounting bracket is cut with Fabspeed’s FLOW Waterjet technology and is designed to securely hold the muffler, with hardware for installation included. Factory Porsche muffler band straps help keep everything in place.

Sound

• The Fabspeed exhaust system enhances the characteristic sound of a factory Porsche exhaust with a noticeable increase in volume. With PSE off (valves closed), the exhaust remains tame and comfortable within the cabin. However, with PSE on (valves open), the flat-six engine delivers a thrilling howl all the way to redline. The larger over-axle pipes included in the system also contribute to a more pronounced tone.

Power

• The 991 GT3 muffler, designed by Porsche to support 47hp, flows much better than the 981 GT4 muffler, which was only designed for 385hp. The increased flow, aided by Fabspeed’s larger over-axle pipes and muffler inlets, is expected to result in a noticeable horsepower increase.

Features

• CNC Mandrel bent 2.5″ precision over axle pipes
• Helical Aerospace United Kingdom exhaust valves
• Valves contracted with 321 stainless steel and silica carbide
• Constructed from 14-16ga T304L stainless steel tubing
• Direct bolt-on installation; no cutting or welding required
• Premium Fabspeed exhaust tips or use OEM 991 GT3 tips
• All Fabspeed performance products are backed by the Fabspeed lifetime warranty

Applications

• Porsche Boxster Spyder: 981 (2015-2016) [3.8L F6]
• Porsche Cayman GT4: 981 (2015-2016) [3.8L F6]

Notes

• All Fabspeed products are expected to ship within one week of order, though timelines are often much quicker
• Owners can use factory 2007 997 to 2019 991 GT3 tips or opt for Fabspeed’s GT3 exhaust tips
• Not designed for vehicles equipped with PDK transmissions
• OEM GT3 center muffler is not included

About Fabspeed

Fabspeed Motorsport is situated in Fort Washington, Pennsylvania, within the United States of America. Their extensive 26,000 sqft. facility serves as a hub for various car clubs, including Porsche Club of America, Ferrari, McLaren, Lamborghini, and more. The company is renowned for its comprehensive approach to product development. They handle the entire process, from design and engineering to dyno testing, street trials, and racing assessments, ensuring the quality and performance of every item. Fabspeed also collaborates closely with race engine builders and tuners hailing from Italy, Germany, and the United States, resulting in the creation of the Ultimate Performance parts. To cater to their passionate global audience, Fabspeed meticulously crafts systems using aerospace-grade austenitic stainless steel, titanium, and carbon fiber materials, setting a standard for excellence in the industry.