Headers - NSX (91-05) - Stainless SystemThese are a direct bolt on for the 1991 1994, 95 99, (00 05 Models require additional parts.) These were designed mainly for the 95+ and 91+ automatic models. These can be fitted for the 91 94 models with the included header adapters but we still recommend our other 91 94 specific model headers for those years. Collector size is 2", runners are 1. 77" 24" o2 Wire Harness Extension and Gaskets are included. These will fit both manual and automatic