Originally Posted by berktechnology.com

Thermal barrier coated using High Performance Coatings (HPC) Hipercoat 1600+ process on the inside and outside of the header. The Hipercoat process helps maintain high exhaust gas velocity which is key in header design and ultimate power production. One of the few 304 stainless & inside/outside ceramic coated headers in the world. Uses large port 50mm primaries & high flow CAD designed 63.5mm collector (2.5"). Perfect compliment to the Berk Technology 2.5" test pipe. Includes secondary wideband O2 sensor port for fuel tuning. One of the best performing headers for the AP1 & AP2 S2000 at any price.

Originally Posted by berktechnology.com

Features a stainless steel high flow Magnaflow cat that meets strict OBDII compliance laws. These use Magnaflow's new metallic substrate core. Less weight, more durability, and higher flow than your standard ceramic subsrtrate "high flow cat". Do not confuse these with cheap Chinese made ceramic substrate versions! These are very high quality parts made proudly in the USA by our expert fabricators. The cats themselves are also available in our store. Magnaflow part number is 59956.

Our test data shows that this cat flows 87% as well as a test pipe vs. 43% for the OEM Cat. Smog legal, high flow, no test pipe smell. You can have the best of both worlds.