H&R Sport Spring - Porsche 911/964 RS America RS America 1991-1994. The most popular spring in H&R's line-up, Sport Springs will lower your vehicle an average of 1.5 - 2 inches (depending upon the make and model of your vehicle) for a lower center of gravity, improved handling and a more aggressive appearance. Sport springs feature more control than that of the OE Sport spring, but is still comfortable for daily use. Sport springs are an excellent choice for street and occasional track use.