I'm with Moddy. TD05-20G. Will be good on the 2.5L and easily get you the 300HP you are after Dan (im getting that with an 18G but the 20G will be better up top and give better torque spread over my 18G and obviously your VF43).
Speak to ASG (assuming you are doing a re-verso) about support stuff like injectors. You may/may not need them but ASG will know better.
Sigh, makes me wish I just went with a 20G in the first place haha.
Good luck with it Dan.