ScienceofSpeed 1997-99 Header Adapter Kit - NSX, 1991-94

This kit allows 1997-99 factory exhaust manifolds to be installed on 1991-94 NSX.

The 1997-99 NSX exhaust manifolds feature a revised tubular design that increases engine exhaust flow compared to the 1991-96. These exhaust manifolds are shorter and have a different joint design than the early NSX. This kit joins the 1997-99 headers with the 1991-94 catalytic converters with adapter tubes and required hardware. While the factory 1997-99 exhaust manifolds do not flow as well as full tubular headers, like the ScienceofSpeed Version 2 Advanced Headers, they do flow better than the 1991-96 cast exhaust manifolds. 

The adaptor kit includes adapter tubes, hardware, and seals. An optional oxygen sensor extension harness kit is available and required if using 1997-99 factory manifolds.

This kit requires 1997-99 factory manifolds (2000-05 are not compatible) and 1991-94 catalytic converters. This kit can also be used with aftermarket headers that have the same flange position as 1997-99 factory manifolds. Please note that not all aftermarket headers have the flanges in the same position as 1995-99 manifolds. ScienceofSpeed has verified fitment of these adapters with factory 1997-99 manifolds and ScienceofSpeed Advanced Headers. Fitment is not gauranteed with other brands of aftermarket headers.