GrassRoots Motorsports. Instead of being full of reviews of $100,000+ cars I'll be lucky to ever ride in, and will never own, they're all about going fast for very little money!
Also MPH. When it came out, it looked like it was trying to be Maxim with cars. I've picked up the last 3 or 4 issues, and it's an excellent magazine. Like the British car shows, if they don't like the car, they'll actually tell you. Also they do try pretty hard to be funny, and they mostly succeed!
Both worth my time and money.