H&R's Sport lowering springs are progressive wound, so this 51652 set is built to ride more softly over small bumps and firm up as the car loads in corners or under hard braking. That combination is the main reason to choose it over the factory linear springs or a cheap non-progressive lowering set: you get a lower stance and less body roll without giving up daily ride quality on an SN95 or New Edge Mustang.
Fitment is the detail to confirm before you order. The listing covers 1996-2004 Ford Mustang V6 and V8 models, but Cobra compatibility varies across sources, so check with the manufacturer before buying for a Cobra. Owners on user forums say a front install on these cars can be done without a spring compressor, though some say you will need a spring compressor, and others report the lower control arm would not drop far enough to seat the spring. Expect to realign the car afterward, since lowering changes front camber and caster. Searchers looking for 96-04 Mustang V6 progressive sport springs, SN95 lowering springs, or H&R 51652 install details will find the specifics below.
The listing excludes the 1999-2004 Cobra, but details vary across sources on Cobra applications. Confirm with the manufacturer before ordering for a Cobra.
Sources do not agree on convertible fitment, so confirm this with the manufacturer before purchase.
This is a moderate-difficulty job, typically a full afternoon or longer for a first-timer. Work on one side at a time and support the car on jack stands under the subframes; a floor jack is needed to position the lower control arms. Gather a 13/16" socket and other deep-well sockets, a breaker bar, pliers, and penetrating oil, and plan to remove the sway bar links and rear shock lower bolts. Replacing the rubber isolators with new ones and using thread locker on reinstalled bolts are both sensible. Budget for a professional alignment once the car is back on the ground.
