+ 11 hp & + 10 tq gain. - 2 3/4 tubing (70mm). - 4 x 3.5 (90mm) round tips. - net weight is 16.4 kg / 36 lbs. (10 lb savings over stock 3.4 l mufflers) - German v2a - x5crni18-10 - 1.4301 stainless steel for improved durability. - 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+). Power is stated at the crank. 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. 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 aero- quip ball style-connecting joint so they can be perfectly adjusted and centered.

This item may need to be sourced from Germany and would take 2-4 weeks to arrive. Once ordered it cannot be canceled. Please call to check stock or request expedited shipping.