Midnight Z
The Nissan 370Z (Fairlady) is an attractive car no doubt but when paired with the Rays Volk Racing CE28N wheels it truly looks spectacular for a non-exotic.
http://farm6.static.flickr.com/5217/5387207792_f764553603_b.jpg
I was looking for a car with under 500 bhp to use online and this fit the bill quite well as the weight is fairly low and I like looking at it. I followed your tune exactly except I left out the Rigidity Improvement as I believe some online lobbies don't allow it in the regulations and was eager to give it a go. I did have to put on Racing Soft Tires as everyone else in the lobby was using those.
First thing I noticed about the Midnight Z is that there is virtually no understeer. If anything it prone to a bit of oversteer (which I'm sure is partly because of my driving style) but it does feel very balanced. Its a very responsive car that can change directions quickly while remaining stable as long as you go a bit easy on the throttle. I like that very much since that adds to the excitement. Given the Midnight Z is Supercharged and not Turbo Charged the throttle response is phenomenal but not at all overwhelming.
In my first race online I was doing well and moved up to third place on Grand Valley on the fourth lap of five. There was a Subaru WRX STI in the lead that I gave up on catching since he was driving well and weighed in at 100kg less but I had second in my sights. Unfortunately on the last turn before the straight I happened to mash the throttle a bit too early and spun a bit which resulted in a fifth place finish. I did come in second a couple of times later that day but more importantly had a blast driving it.
I managed a 6:51 lap of the Ring with Racing Softs and got a bit of lift on the first section. The Z touched down safely and all was well.
I'm sure a better driver could shave off a few seconds.
http://farm6.static.flickr.com/5212/5387207662_f1ab0b84e6_b.jpg
I have over 80 premium cars that I have bought / won but the Midnight Z is in my top five favorites without a doubt. It's quick, handles great and is fun to drive. I love that it can achieve this level of handling while looking completely stock. (I liked the stock exhaust tips so I did an oil change and drove the car for 120 miles or so to achieve 503 bhp instead of purchasing a racing exhaust. I guess you could look at it as a money saving tip if you're low on credits.) Thanks for your hard work Roj.