Tires OEM Chevrolet or Goodyear

Yes they are. I replaced mine with Sumintano HTRZ IIIs and things quieted down considerably.

Like Tim said above, it depends on the tire. Some are more dedicated to pure dry weather grip, some have a better rain compound and tread. Like poster #2 above, I have Goodyear F1's. The reason I chose those is because they are just about unbeatable in the rain, it's like driving on a dry road. They can stand the car on it's nose under braking, and grip harder when turning. They give up very little in dry ultimate grip, too.

It depends on the tire. My Eagle F1 GSD-3's are *awesome* in the rain.

yea, the Eagle GT's are what my mother has on her G35. Definitely resist hydroplaning well.

Great tire...Performs awesome in wet and dry conditions:

I really liked my Goodyear F1 All Seasons when I was living in Mass. They are an excellent combo for all weather conditions and performance.

The Kumho and the Conti were nearly identical when I had a chance to drive on them. but the Goodyears were a little quieter and should also be a little more durable.

They're not the best tires. But they're not the worst either. If you hit a pothole, bubbles will form. I have 33,000 miles on my F1's and a bubble has never formed on any of them. They wear relatively fast.

Each of our TRegs have these Goodyear Wrangler HP tires: the 06 v8's became "cupped on the inside" with nil tread-wear ( see this http://forums.vwvortex.com/zerothread?id=3316272 ), despite the dealer checking and rotating each 5k miles -- had to be replaced at 12k miles.

Had the same thing happen at 1400 miles. GY replaced my tire for free because it had less than 1400 miles on it. They then sold me the tire protection plan....fast forward 15000 miles and I get 2 more bubbles.