SOUL | Porsche 992 GT3 Race Exhaust Dyno - Hydra Motor Works Stage 2 ECU Tune

Have a listen to our Race Exhaust System at Hydra Motor Works during ECU Tuning. Our Race Exhaust System by itself added peak gains of 23 whp and 19 ft-lbs of torque with excellent power added in the midrange and max RPM’s. Hydra's Stage 2 ECU tune added massive additional power gains when paired with our exhaust, unleashing total peak gains of 60 whp and 26 ft-lbs of torque and max gains of 60+ whp and 70+ ft-lbs of torque - quite incredible to see on a naturally aspirated engine. The software is quite limited from the factory in the lower RPM range to due to the implementation of GPF filters in the headers and ever increasing emissions standards. By removing the GPFs and the other restrictions in the exhaust, this allows the ECU tune to unlock the true potential of the 4.0L.
Built for maximum power and sound for the 992 GT3 with interchangeable cat sections. Long tube runners and CNC’ed merge collectors optimize flow through the headers out to straight 3″ piping with an x-pipe for a higher pitched and smoother sound.
See the dyno graph and products here: soulpp.com/pro...
HEADERS
For those individuals looking to maximize performance, shed over 25 lbs, and realize full sound potential a complete race system is a logical conclusion. Removing the heavy and restrictive factory headers is central to the performance improvement. 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.
Even a premier engineering masterpiece like the GT3 comes from Porsche fitted with exhaust manifolds restricted in terms of primary tubing length, runner diameter, and merge collection efficiency due to dense catalytic converters, mass production, emissions and sound restriction compromises. By refining the interface between the flange/primary tubes, using smooth radius large diameter bends, and implementing performance oriented collectors with merge spikes, we have been able to achieve increased flow, response, and performance with a more aggressive exhaust note to match. A slip on merge collector was not considered to prevent any chances of exhaust leaks. Instead we focused on designing a high flow collector from CAD to CNC for a no compromise end result. This bespoke billet collector allows for maximized runner length and the elimination of several welds in the interest of durability. Our billet CNC head flanges allow for a more efficient transition from exhaust ports into the runners and adds extra strength in a high stress area preventing the chances for any cracking from repeated, hard use during track days.
REAR EXHAUST SECTION
The rear of the SOUL Race Exhaust System is optimized into a single, full 3″ flow. The design of the factory system includes very large catalytic converters terminating into a very heavy dual entry muffler with restrictive piping with variations throughout the flow path which hinder performance. Those seeking a race setup will appreciate the 25+lbs weight savings and concentration on increasing exhaust flow.
From there we dove into creating a header-back system to maintain maximum flow characteristics with a higher, smoother pitch and aggressiveness akin to an RSR race car. This full 3” diameter system is made from thick .065” wall T304L stainless steel and TIG welded with back purging to ensure it withstands hardcore track abuse. It’s also modular to allow interchanging between catless or high flow catted assemblies with minimal effect on exhaust velocity. Reduce the chance of CELs with 200cell cats and tone down the exhaust if need be as the catless version is without a doubt the loudest and most aggressive system we have ever built. After the catted/catless section, the exhaust flows into an X section where we took care to minimize the diameter reduction while maximizing the blend of the exhaust to create that higher smoother pitch you hear in the videos. Finally a tip plate (same used on 991 GT3’s) allows one to switch between tip assemblies at their convenience.
CONSTRUCTION: Each component 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.
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