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From what I have read, the only difference between the sport shocks and the HD is length. There are actually three - B4 (standard), B6 (Heavy-duty) and B8 (Sport).
The B8 is intended for cars that are lowered. If you put lowered springs on an HD shock, there might be a gap in the springs when the car is on the lift.
Again, this is what I found doing the research. I have B8 shocks with normal springs from the PO, which isn't what I would do but it works fine.
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Dan, Kansas City
2001 986
2003 996
2011 Yukon
2014 A6
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