Skunk2 B Ultra Race Manifold Secondary Black High Volume Fuel RailsEngineers at Skunk2 Racing have developed primary and secondary fuel rails for the popular Ultra Series Race intake manifold. Skunk2s newest fuel rails are made from 6061 T6 aluminum, features large 0. 669 inch internal bores and 8 AN o ring thread, and can support up to 1,200hp. This Part Fits: Year Make Model Submodel 1997 2001 Acura Integra GS 1992 2001 Acura Integra GS R 1994 2001 Acura Integra LS 1994 1998 Acura Integra RS 1995 1996 Acura Integra