I tried adding this in the bootstrapper in the ApplicationStartup override.
pipelines.AfterRequest.AddItemToStartOfPipeline(ctx =>
{
  ctx.Request.Headers["x-fcr-version"] = "1";
});
Its giving me errors.
Can anyone point me in the right direction?
Notice how you are trying to set the Request while trying to manipulate the Response ?
Try this..
protected override void RequestStartup(TinyIoCContainer container, IPipelines pipelines, NancyContext context)
{
    base.RequestStartup(container, pipelines, context);
    pipelines.AfterRequest.AddItemToEndOfPipeline(c =>
    {
        c.Response.Headers["x-fcr-version"] = "1";
    });
}
This is what my Response looks like..

Or .. you can use Connection Negotiation if you're going to set it at the module level...
Get["/"] = parameters => {
    return Negotiate
        .WithModel(new RatPack {FirstName = "Nancy "})
        .WithMediaRangeModel("text/html", new RatPack {FirstName = "Nancy fancy pants"})
        .WithView("negotiatedview")
        .WithHeader("X-Custom", "SomeValue");
};
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