By fitting the greenstuff pads you have uprated the braking ability of your car. 99% of the time people go balls out getting their cars faster but neglect the important stuff, i love going stupidly fast at times(have maxed out my GT4's many times...thats 150+mph) but i always drive within mine and the cars capabilties. Neglecting the braking of your car is at your own risk. As i said before it should be a first basic mod, then as your feast for speed/power increases and the spec list increases you don't have to find out the hard way that sorting the brakes out shoulda already been done. Fitting a decat or air filter won't give you warp speed but the increase in noise etc will encourage you to want to put the foot down more....going faster will heat the brakes more causing fade of standard brakes etc etc. Do what you want in your own cars i really don't care, many have come before and any will come after with the attitude that braking/tyres/suspension upgrades arn't needed till you have silly power. Plenty have regretted it Thats my 2p.