H&R Lowering Springs G8Only For All Things G8 2008 Pontiac G8 with 19x8.5 33 Rohana Rfx5 and 245 40R19 Continental 08 2008 Pontiac G8 Strut Assembly Suspension AC Delco, Eibach 2008 Pontiac G8 with 19x8.5 33 Rohana Rfx5 and 245 40R19 Continental H&R Springs installed pics. Pontiac G8 Forum. Sport Spring kits are H&Rs number one selling product. Enhance the look of your 2008 2010 Pontiac G8 with a reduced fender well gap. H&R Sport Springs lower the vehicle 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 vehicles suspension, you cannot go wrong with installing Sport Springs. Fun to drive, H&R Sport Springs are the number one upgrade for your vehicle. Lowers vehicle approximately front 1. 4" front & 1. 3" rear.