A big thumbs up to Paul and Sam at Radial Tire in Silver Spring. I went in with a set of Pirelli PZero Asymetrico's that had 9,000 miles on them. Had a very bad shaking in the front end . Sam helped me and instead of trying to sell me tires, he made me get only a balance. Said that should take care of it after having inspected my tires. I thought "great" and was on my way. Well out on the freeway the shake had been reduced but not eliminated. I called Sam and ordered a set of Michelin PS2's. Thursday I had the tires put on, and Paul balanced them himself on the car. What a difference! Immediately everything smoothed out. No more shaking even in leadfoot land. Still I thought there was a little pull to the left. Called HBL and got an appointment for Friday morning and went in and the front was out of alignment, so had that taken care of. And the best part { besides the fact that the car now is perfect}, HBL only charges $149.95 for the 4 wheel alignment! An actual bargain in Porsche-land! Yee Haa!