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Moved to apple chat, if you were to have searched in this section there are a few threads about this already,
The best deal for you, might be different to someone else.
I suggest a search in here, and on the www.
Standard porting on the head is very good. They arent 172bhp, they are 169bhp. But very rarely make that.
In terms of gains it wont be alot for matched inlets. You will need to spend £000's to get power.