Good service BCR 8ES plugs, remove dump valve, keep std airbox but cut the front off (where the circular hole is on on the lid)

more power if engine is ok?

Chip, GRS/Airtec Cooler, Newman cam, and obligatory boost, BUT get it setup by a reputable company

Also reccomend some uprated suspension and maybe front brakes, wouldnt bother with rear discs.