H&R ID Race Springs | Porsche 911 GT3 RS (17-19) (54090)Porsche 911 (991) GT3 RS ID Springs by H&R The Porsche 911 GT3 is a fantastic performance vehicle. The stock GT3 has threaded shocks for fine tuning ride height, but some enthusiasts would like to lower their GT3 a little more from factory ride height. H&R ride development engineers have been listening and designed a set of RS ID springs for reduced fender well gap. H&R RS ID Springs are a combination of their 60mm ID Race Springs to lower the GT3.