The H&R 29782 is a four-spring set of sport lowering coils for the X100-generation Jaguar XK8 and XKR, covering coupe and convertible bodies from 1997 through 2005 under the QEV/QDV platform codes. The springs are made from 54SiCr6 spring steel that is shot peened. Owners on user forums describe about 1.5 inches of drop at both axles, which closes the fender gap and lowers the center of gravity. Aged stock springs often sag, and owners on user forums have pointed to H&R as a lower-cost option than several well-known lowering brands. Expect firmer body control and less body roll through corners, but also a stiffer ride. Owners on user forums suggest pairing the set with quality dampers for the best balance.
The 29782 suits 1997-2005 XK8 and XKR owners who want a 1.5-inch drop on a budget. Rear installation is the simpler job. It involves lifting the car, disconnecting the sway bar end link and shock, and dropping the wheel to free the spring. The front struts require a spring compressor, so most DIY installers should plan on a shop for that step. Because lowering shifts rear camber toward more negative, owners on user forums commonly recommend a four-wheel alignment afterward, and some need rear axle shims to bring camber back into range. Search terms that match this product include 1997-2005 XK8 XKR lowering springs, X100 QEV QDV sport springs, and XK8 rear camber shims after lowering.
Owners on user forums report that H&R told one owner its springs were never made for the 5.0-liter XKR, only up to the 4.2-liter cars. Confirm fitment with the manufacturer before ordering for a 5.0-liter car.
Owners on user forums report that rear camber moves more negative after lowering. A four-wheel alignment is commonly needed afterward, and some owners end up adding rear axle shims.
Owners on user forums report a firmer ride with these springs, and say wheel and tire size can make the change more noticeable.
Difficulty is moderate. The rear springs are the more approachable job: support the car on stands, disconnect the sway bar end link and rear shock, let the wheel drop to release tension, and remove the spring. Front struts need a spring compressor, which is the main reason many owners pay a shop for the front. Common gotchas: the car must be aligned afterward, rear shims may be required, and owners on user forums note that tire clearance should be checked against the lowered stance. Owners on user forums also suggest having the springs installed professionally if you are not set up to compress coil springs safely.
