Car Tuning (NFS Carbon)

['86 Firebird]

Hello all. I'm new here.
Now before I start, I want you to know that I DID use the search function and it didn't find what I was looking for.

What I am wondering is, what tunings do you have for you cars? Certain drift settings, more torque etc. and for what car. I have two career modes going, one is tuner, and one is muscle, so I'm open to any tuning for any car. My muscle cars are the Camaro SS and the Dodge Charger, and my tuners are the RX-8 and the RX-7.

Any help would be greatly appreciated.

And if it makes any difference, I have it for the XboX 360.

Thanks in advance.