Yeah a 96 header will fit on a 91, unless its a OE manifold, then it will not work as the 91 has AIV and 96 don't. Mike Jez 93 SE-R GTi-R TO4E, water injection, 72lb injectors, Cobra MAF w/ JWT subtractor program, custom Fmax style equal runner manifold, yadie yadie yada 01 Max with new Magnaflow exhaust on the way.