Description HEADERS Replacing the heavy and restrictive factory headers is central to improving performance. By pursuing a full system replacement we can eliminate the restrictive cat assemblies, the particulate filters, and the giant 7 ⅝ connection point to the factory rear muffler assembly. A simple flange optimization to our previous generation GT3 Competition Headers allows us to get rid of the factory 991 gen connection point requiring costly OEM clamps and donut gaskets and utilize a more efficient v-band connection point. REAR EXHAUST SECTION With limited room under the vehicle we had to craft an intricate solution and loop the exhaust to keep the cats in line after the headers to maximize exhaust velocity. A muffler proved to be the most effective way to reduce the drone level under 3k rpm enough to meet our goals for reduced cabin presence for an exciting touring level of sound. With valves open, exhaust is free to flow through 3” piping and an x-pipe that merges the exhaust flow for a higher pitched, smooth sound with maximum flow characteristics. With valves closed the exhaust is routed through secondary flow path piping and a bespoke SOUL muffler. The internal design has little to no restriction in the flow path, using straight-through perforated piping to allow exhaust gasses to escape and become muffled in the surrounding packing material of the muffler body. The muffler also incorporates an internal x-pipe to allow the exhaust flow to merge smoothly. All of these characteristics are crucial towards reducing and smoothing out the drone in the sub 3,000rpm range while enhancing the higher pitched note we were after in both the valves closed and open conditions. The catted/catless sections are interchangeable. You can reduce the chance of CELs with 200cell cats and tone down the exhaust if need be, or you can run the catless section to amp up the fun and performance on track. We also utilize a tip plate (same style as used on 991 GT3’s) allowing one to switch between tip assemblies/styles. . VALVE CONTROL The exhaust valves on this car have electronic actuators mounted to a free moving mechanical valve body. Factory exhaust valve programming has the valves closed until 4k rpm, then gradually opening from 4k-5k rpm at which point they are then fully open. For those looking for full valve override so the valves are 100% open at wide open throttle regardless of rpm, ECU tuning is available to achieve this. The valves on this platform have taken a notable amount of R&D as relocating or disconnecting them can cause check engine lights and performance issues. The actuators themselves are what keep the tension on the valve bodies, so you can’t take them off and have the valves default open via spring pressure like previous vacuum actuated OEM valves. The included hardware ensures proper valve operation and prevents any chance of issues. SOUND In summary, this system was designed to offer a more desirable sound experience with tone enhancement under all conditions. Enjoy more presence during casual driving and an aggressive wail summoned by your right foot. Higher pitched and more refined in the low end than a system without muffler Comfortable under 4k rpms with a reasonable level of cabin presence/drone. Noticeable delta of sound level in and outside the car with the ability to fly under the radar with valves closed during casual driving. With valves closed, volume is increased by a refined amount. The sound is not only more pronounced, but smoother and more exciting with more tone than the dull, hollow factory exhaust note. Aggressive at wide open throttle when valves begin opening at 4k then fully open at 5k. A streetable, reasonable level of volume on command compared to a muffler-less system that is loud at all times. CONSTRUCTION: Each system is assembled in the USA out of mandrel bent, thick wall .065″” T304L stainless steel. Our billet 304L stainless steel head flanges and merge collector are precision cut on a 5-axis CNC machine for the best possible exhaust flow and strength. Back purged TIG welding (with ARCAL™ Prime argon gas) ensures proper weld penetration and longevity – crucial for durability on the track. CHECK ENGINE LIGHT?: The catless Competition version may trigger a check engine light due to removal of factory catalytic converters. We suggest a custom ECU tune to disable any check engine lights (for track use only). LIFETIME WARRANTY: Enjoy your SOUL exhaust components with confidence on both the street and track as they are covered for life! NOTES This product is not CARB certified and may not be legal for use on emissions controlled vehicles; intended for closed course competition use only United States based customers purchasing this product are required to sign our Catless Exhaust Component Waiver here.
