Difference Between QA1 "F" and "R" Struts
#2
11 Second Club
iTrader: (1)
The R series have fixed compression, adjustable rebound. With the F the compression adjusts with the rebound. For the street, the f would be better I believe. R is good for drag racing as you can loosen the rebound but compression stays firm so car doesn't bounce up and down while shifting.