X2 Bigger Body also pointless.
Save your money, spend it on a decent airbox setup, Ex Manifold and system. S300 will get everything working together properly.
Also spend some time giving the engine a good service, making sure all earths, distributor, leads and general electrics are all in good health. Surprising how much Earths and electrics sap performance if they are not up to scratch.
Then you'll be set for a Remap and Dyno.