@SubscribeEvent
public void addRotation(RenderPlayerEvent.Pre event)
{
    EntityPlayer p = event.getEntityPlayer();
    if(this.isPassenger(p))
    {
        double visualPitch = this.capab.getRotPitch() * 180 / Math.PI;
        double visualYaw = this.capab.getRotYaw() * 180 / Math.PI;
        GlStateManager.pushMatrix();
        GlStateManager.rotate((float) (180.0F - visualYaw) / 2, 0.0F, 1.0F, 0.0F);
        GlStateManager.rotate((float) (visualPitch - 90.0F) / 2, -1.0F, 0.0F, 0.0F);
    }
}

@SubscribeEvent
public void removeRotation(RenderPlayerEvent.Post event)
{
    if(this.isPassenger(event.getEntityPlayer()))
    {
        GlStateManager.popMatrix();
    }
}