i did some research and as far as i can tell the cai is a better route as the induction kit can cause issues but then people have managed to modify the kits and have had no issues.
I then read about keeping standard airbox and taking out the big palstic resonator box in the wing whioh gives a bit of induction noise but it looks as though this reduces performance.
I forgot how confucing and conflicting modding was lol.