Single adj. are good for most street cars. DA fronts allow you to change the compression vs. rebound ratio and turn a street or performance handling shock into a drag shock by just turning two knobs. We usually only use DA rears on big horsepower cars on small tires. They use a lot of weight transfer to hook up their power and it can transfer back too fast unloading the rear tires and causing them to go up in smoke part way down the track. DAs allow you to dial in more rebound to retard the weight transferring back up front and keep them hooked better. If you`re not in that boat DA fronts are much more useful. We`ve used both QA1 and Varishock over the years and we have plenty of both come into the shop. IMO the Varishocks are more reliable, more repeatable and better built. We`ve tossed more than a few sets of toasted QA1s right in the dumpster. Spend a few bucks more and get the better product. Think carefully before you order coil overs and ask yourself why you want them. Even the best conversions involve some compromise and you way be better off with adj. shocks and conventional performance springs. If you want adj. ride height too just use SPC Performance tubular lowers with adj. ride height. Mark SC&C
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