The H&R 54097 is a lowering sport spring set for the 2006-2012 Porsche 911 (997) Carrera C4 in Coupe, Cabriolet, and Targa body styles, sized for the non-Eurosport chassis with PASM (Porsche Active Suspension Management) equipped cars. Compared with stock springs, a progressive sport spring lowers the ride height and tightens body control through corners, which is the usual reason enthusiasts choose a dedicated spring over a generic lowering kit. Searches for "997 C4 H&R sport springs," "997 Carrera PASM lowering springs," and "Targa C4 sport spring fitment" are the best match for this part.
Fitment matters on this platform. The 997 C4 uses the all-wheel-drive layout and PASM dampers, so confirm your car's exact body style, drivetrain, and suspension equipment before ordering, and confirm that the set is not intended for Eurosport-spec cars. Because the springs change ride height, owners often plan to have the alignment checked after installation and to recheck headlight aim. Confirm the spring rate and any ride-height figures directly with the manufacturer before relying on them.
