The H&R 51662 is a four-spring set for the 2008-2011 Ford Focus S, SE, SEL and SES in sedan and coupe bodies. It is made from 54SiCr6 spring steel, shot peened, with a progressive spring design that reduces ride height. Every H&R spring comes from the company's ISO 9001 certified facility in Germany. The manufacturer's listing gives a 1.5" front and 1.3" rear drop. That is enough to close the wheel gap on a stock Focus without the cost of coilovers. Owners on user forums note that the drop is about 1.5" and is perfect for my daily drive, which suggests the spring suits street use more than track work.
Because these are lowering springs, they change the spring rate and ride height but leave the damper alone. Owners on user forums warn that they will wear out with the lowering springs, so budget for matched dampers if you plan to keep the car long. For a buyer searching for 2008-2011 Focus sport springs, the value is a lower stance, reduced body roll, and a firmer feel than stock, paired with a lower per-corner cost than a full coilover kit. The manufacturer's listing says the springs work with factory shocks, but details vary across sources, so confirm your damper setup before ordering.
Installation is a practical DIY job for someone with a jack, stands and a compressor. The rears are quick once you have done them a couple of times, with both springs swapped in about 20 minutes. The fronts need a compressor, and the lower control arm bolts on these cars are often frozen. Plan on a wheel alignment after the install. Search terms that fit this product include H&R 51662 lowering springs, 08-11 Focus sport springs, Focus sedan coupe lowering kit, and progressive rate sport springs.
The manufacturer's listing says the springs work with factory shocks, but owners on user forums caution that lowering springs on stock dampers wear out sooner. Many recommend upgrading the dampers at the same time, and you should confirm the full combination with the manufacturer before installing.
Owners on user forums say yes. Ride-height changes alter suspension geometry, so a wheel alignment is recommended once the springs are in.
Owners on user forums describe this as a manageable driveway job with the right tools. Plan on a spring compressor for the front struts, jack stands, a floor jack, a breaker bar and a torque wrench. Pay attention to the spring isolator's position against the spring seat on the front struts. On the rear, a frozen lower control arm bolt is a common obstacle, so soak it in penetrating oil before you start. Finish with a wheel alignment.
