i think dee00 is saying that with an uprated clutch and box you might aswel exploit the better transmission by running more boost which will create more power. If the car is running fine keep it as it is then save up for both the clutch and the box, once you have enough fit both things and whilst your there remove the a.b.s if you feel the need to. Then go for a tune up, at least you know you have a solid box that can take whatever you throw at it. Also if you aint got a b&m shifter i would consider saving some more for one

best of luck mate and its only advice i am giving so i hope it is of help.