Well I'm level 30 and I don't even bother with the modding as every car I've found is toss or can't be tracked.
Free for people who created a RSS account.
Of course they are not going to give anyone free access to the fastest cars from level 1, otherwise there would be nothing to grind for!
I stole a nice coupe last night, dropped a tracker on it for £12k, it's a bit of beast when upgraded. Not a sports, but one of the fastest I've seen that's trackable.
I will have a look for some of the ones on the previous page and get the free one off the internet. I've obviously not been looking hard enough! Thanks for the suggestions guys.