If you are going manual get a BA MkII so you get the 6spd and factor in a new clutch. As soon as u wind it up you will cook the clutch. Mal Wood option 3 are about $1500 not fitted, it will support what you want to do and the car will still be extremely streetable. If you are going higher than 350rwkw consider an option 3+ or option 4, and a stronger bottom end. For the price of the CAPA kit you have numerous options. XCAL3, HDI cooler, injectors, cat, fuel pump and a tune I am guessing would bring the total to somewhere around the price of the CAPA kit. Also throw an F6 intake on for good measure.