We wanted to share our latest updates on the 718 GT4 development. Take a look here to see how we've progressed thus far. We are stoked to share more details on our Street Exhaust system. This is a complete replacement from the cylinder head to the factory muffler and is comprised of three pieces per side: the exhaust manifold (header), the over-axle pipes (which contain the catalyst), and the muffler adapter. The reason this is only offered as a complete kit (and not individual components) is that our system was optimized for producing horsepower (using stock mounting locations limited power gains). All components are made from mandrel-bent, TIG-welded 321 stainless steel. These connect using gasketed v-bands for easy install and a complete seal.
This system was designed to bolt on to the car with no permanent modifications. We accomplished this by scanning the car and modeling our design in CAD, then building a prototype. After a couple of revisions we have production parts in process!
Of course, we build parts to perform, not just sound cool, so we verify everything on the dyno. The dyno proved compelling on our initial prototype, so of course, we went after more performance and learned about what the factory ECU will and will not allow. Ultimately, we landed on the right combination and it netted a 30 wheel horsepower gain with a chunky dose of torque through the whole powerband.
Peak gains of 30whp (above) and 28wtrq (below). All dyno graphs are SAE corrected using our in-house Dynapack chassis dyno with the car connected to the factory PIWIS tool and in "Rolling Road" mode.
These gains are strictly from bolting the exhaust system on the car. No tune is required, and there is no check engine light. Check out the video below for additional details and the most important part: sound clips!
We are eager for better weather and are planning to get 60-130 times and on-track data ASAP! Until next time, stay tuned!
Bonus! The upcoming "CrackPretzel" for 718 GT4!!