In Reply to: That IS NOT a GRP A header! posted by Mike on December 17, 2001 at 14:27:04:
Some info. on header part numbers can be found here:
There were two types of Gr A headers that are seen on the parts CD. One is what everyone calls the "Rally Header". The other is the Evo III header.
The Gr A catalogue lists additional headers for the various years of Gr A competition. One has to keep in mind that some of these headers were designed for 2.3L engines while others were designed for 2.5L engines. All of these headers will require a custom exhaust and will have a single outlet.