The Efi Exhaust Upgrade Kit is a critical component for enhancing the performance of EFI systems. This kit creates a secure, leak-free environment around the O2 sensor, ensuring optimal operation of your EFI system. Designed specifically for James Duff exhaust systems, it is compatible with the 2 into 1 systems #3060/3061 and the dual exhaust system #3095. For separate purchases, exhaust paste is available under part number #3058, and premium header gaskets #3050 are recommended for achieving the best air-tight seal.