You only need the whole intake package from KB, which is worth another 30+rwhp over stock because of the stock restrictions : KB cold air (includes a 12" K&N, 90mm MAF, 75mm TB and 75mm big pipe).
For the alum flywheel I don't know yet, I'll have installed in a week, along with T56 tranny. For sure it will make a difference on lower gears. On the dyno, since it's done in 4th gear, it might still improve by a few rwhp but should be less significant than on a stepper gear.
Since you car is non s/c it should already have the gears, an alum driveshatf would be nice though!