Probably not much gain at that rev range for the TD04 15G unless you plan to rev till 8k rpm?! Anyway, I did not see the AFR of your dyno is it rich over 6k rpm
If you can do dataloging and a knock reading try and please try with caution to play with the ignition setting there might be a few horses to be gained there. Good luck & keep us posted
If you can do dataloging and a knock reading try and please try with caution to play with the ignition setting there might be a few horses to be gained there. Good luck & keep us posted