The headers on this latest 991 system include a double plated flange. This flange dissipates heat and vibration more efficiently and consequently does not warp like thicker single plate flanges commonly used by others. This small advancement is time consuming to make but is added in order to prevent loss of power over time and will ensure years of trouble free operation even under severe track conditions.



The header piping incorporates a 2 3/4 motorsports style merge collector. The collector smooths out exhaust flow and turbulence created from the 3 primary pipes merging into one. Collectors create more velocity, which reduces back pressure and creates torque. This systems collector gently guides exhaust gases from the walls of the piping towards the center and lowest point of the 2 3/4 tubing. This dramatically reduces power robbing turbulence and increases the volume of gas and gas velocity which translates into superior low end and mid-range torque.



The catalytic converter cores used in this system are the most advanced in the industry. They are produced by hjs in Germany and are a 200 cpsi (cell per square inch) tri-metal design. Tri-metal cats are the freest flowing and environmentally friendly aftermarket cats produced today. Tri-metal catalytic converters perform all three necessary and mandated reactions to prevent pollution. Reduction of nitrogen oxides to nitrogen and oxygen, oxidation of carbon monoxide to carbon dioxide and oxidation of unburnt hydrocarbons to carbon dioxide and water simultaneously.



The muffler section of the exhaust system 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.



Additional features:



+ 25 hp / + 20 tq gain

200 cell hjs hd sport catalysts

25 lb. Weight savings over OEM system (59 lbs vs. 84 lbs)

2 3/4 tubing (70mm)

4 x 3.5 (90mm) round tips

Motorsport merge collector

T316 stainless steel for improved durability over t304

Absolutely no drone in the cabin

Aero quip style motorsport connections ensure a leak free exhaust

Does not interfere with emissions, will not trigger cel

Ecu programming (software) is not necessary

Under load (moving) with valves closed: 85db

Under load (moving) with valves open: 90db