or buy a GTi, by the time you've done this you'll insurance will be through the roof.(IF you declare it...)
I had a 1.8 Driver for a few months, as i turned 18. I dreamed of doing all this stuff to it, and making it so much quicker. Added up it'll cost a bomb and ALOT of effort. So i went out and bought a GTi. Then you'll need to do the brakes, then you'll have to sort out the handliing.
I know it's a sore point, but i'm so glad i bought a GTi and got rid of the Driver instead of wasting what would've been loads on it.
Or failing that, covert the Driver to a GTi by changing lump.