Yes got a return email from him yesterday late night, he suggested to keep the header as tight as possible as this will effect top end, but the problem with his suggestion is that the only way I can do that is by pushing the pipe further to the right which makes it stick out the wheel arch and maybe around 3/4 inch away from the wheel itself, so maybe prone to damage.
I think I'm going to stick to my way and see how much it effects top end, I prefer my way as I like to keep my rig neat rather than making it ugly just so it goes faster, will see how it goes