This is a baffle kit for Sanderson Jayster Headers available for 3 1/2” outlet. This is a great alternative to under car exhaust system. Easy to install, just bolt to your existing 4 bolt header flange. These baffles are so unique that they hold a US Patent. We can also build these for kits purchased from Speedway with a round flange. We have sold several thousands of similar baffles, and the customers are very happy with the results. And they like the savings, and weight over a full exhaust system. The CC Inserts have been described as a “Sound of Authority”. Don't be fooled by those trying to mimic our design. Choose the product that actually works. See installation feature in Rod & Custom: http://www.rodandcustommagazine.com/techarticles/1101rc_car_chemistrys_lakes_style_header_baffle/index.html The kit comes as a pair. 2 Include 6” long baffles. All High Temp/Polished Ceramic Coated (The same finish as your coated headers) 2 Gaskets 2 Sheets of Extreme High Grade/Temp muffler packing Large cores for great flow characteristics. All components are completely welded. Just bolt on and enjoy!!