I just purchased a set of these 500e springs for my 400e
part # 30230 . I called H&R springs to get some info on these springs. The person I talked to said he believed the part # was used over 7 years ago and was not used in the USA applications and that he did not have any info on these springs. I paid $40 for a set of 4 . My reasoning
is that the 500E springs would have a stiffer rate than the 400e springs and so the 500E H&R sports springs would have a stiffer rate then the 400E H&R springs . IF someone with more info on this subject wishes to set me straight or confirm my thoughts please feel free to left me know. Again this 400E is going to be a track car with little use on the street. I am also planning to go drag racing next week to see if this car can turn a sub 14 second 1/4 mile.