There is a night and day difference between the two. I ran both (in 305's) on my 2010 camaro.
-555r are a decent street tire and aren't terrible in the rain until the tread is low. With the power I had I overpowered them until third on the track.
-ET Streets I wouldn't drive on the street. They wear fast, scary in the rain, and you can feel the sidewalls flexing. They are great 1/4 mile tires though. They hooked so well I broke an axle, rear, and trans output shaft. All separate times.
Hope that helps.
-Joe
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