Some customers wish to install the later model tubular factory Honda NSX exhaust manifolds which in 1997 were introduced to allows the car to flow better.
While the factory 1997+ exhaust manifolds do not flow as well as aftermarket header designs such as these, the factory exhaust manifolds can often be found used at used prices. The adaptor kit includes pipes, crush washers, gaskets, and hardware. Also required is O2 sensor extension kit sold here.
This kit allows the 1997-99 headers to be installed onto a 1991-94 NSX with out modification. Pipes bolt to existing 1991-1994 catalytic converters.