If you have a Phat PS2 and the PS2 network adapter, the install Free MCBoot 1.8 and then back up your *original copy* of GT4 onto a hard drive and play using HDLoader 0.8c
Oh crappy, so you don't have the backwards compatability...
Well anyway, you can find PS2's Phat and Slim for anywhere between $25-$75. They are super-cheap these days. I'd recommend you pick one up since the cost of entry is so low and nearly 2000 games work on it!
Buy whichever takes your fancy. GTPlanet cannot make the decision for you.
But please buy either a spellchecker or some self-respect when it comes to typing. This is the FIFTH time you've been spoken to by the staff about your poor standard of English. Do not let there be another.