Thanks Robin, that was a good read
I won't be doing many (any) track days so no need for the intercooler. So it's probably best to change the CAI and HPFP at the same time,
IF I do?
I will be heading down to a recommended tuner soon but just wanted to get a better understanding before I do. I think PDT have a branch near me (based in NW London).
I am starting to understand what this slippery slope is now