I have a 2002 WRX which has been dealer maintained throughout its 30,000 miles. In fact, I recently did the very expensive (>$500) 3 year/36,000 mile scheduled maintence since the car is 38 months old. In the last 2 to 3 weeks, I've noticed a rumbling vibration when engaging the clutch. I have 2 male teenagers but have managed to keep them both under 200 miles in the driver's seat. Is this just a worn throwout bearing? I really don't think I'm hard on a clutch, but I love driving this car. My real question is: if I need a new clutch, what is the best aftermarket brand/model to look at? I assume that I'll need a grade 2 type but I really don't know much about this and would appreciate some input. Thanks.