2017 - 2022 SOS Stainless Steel Sport+ Downpipes (pair)

Give your 2017+ NSX a proper sporty sound that this car deserves!  The downpipes give the car 70-80% of the sound upgrade.  Swapping just the muffler alone is not as dramatic as it gives about 20-30% of the sound change.  You can see the install and sound clips here:

Please Subscribe to our YouTube channel, see our DIY Install video here:

https://youtu.be/34wA-W8FH10?si=YEkmaMOcmAHTfvoH

Development
To begin development, the factory assembly was 3D scanned. This allowed certain features like the multi-dimensional inlet flange to be replicated. Scanning and fixturing has also allowed all four factory heat shields (front and rear set) to be retained with built in bracketry that supports the shields and uses the factory hardware. Retaining all four heat shields is critically important due to the close proximity of exhaust components to the chassis. 

Construction
The ScienceofSpeed Sport Downpipe System utilizes a catalytic converter designed for high temperature turbocharged applications. The converter set is rated to flow over 170 lb/min of air mass. Compared to the factory converter set, the converters have a larger cross section, less restrictive substrate design, a braised and captivated core, and a higher precision metal wash density for improved emissions performance. The downpipe assembly is fully constructed from stainless steel, including machined flanges, and USA manufactured stainless steel tubing and converters. 

Testing & Validation: Authentic Performance Enhancement
Prototypes were first measured against factory downpipes to verify improved flow performance. The assemblies were tested on a Superflow flow bench using a custom made adapter. At maximum flow bench flow, the ScienceofSpeed Downpipe System improved flow by 126%. Downpipes were then tested on the ScienceofSpeed Superflow chassis dynamometer.