H&r 's sport spring set gives your Boxster the look it deserves with more responsive handling. Enhance the look of your vehicle with a reduced fender well gap. H&r sport springs provide a lower center of gravity and reduce body roll for better handling. The progressive spring rate design provides superb ride quality and comfort. A lower wind resistance signature will make the vehicle more streamlined and improve gas mileage. If you are only looking to improve one part of your vehicle s suspension, you cannot go wrong with installing sport springs. Fun to drive, h&r sport springs are the number one upgrade for your vehicle. This set works on cars with or without pasm. This set works on cars with or without pasm.