HHP Racing Drag Race Springs for 15-22 Challenger & Charger SRT HellcatDesigned strictly off of the highly desirable but impossible to get Dodge Demon springs the HHP Hellcat Race Springs will get you better weight transfer just like the Demon Springs to help your 60ft. Primarily for straight line racing, these will loosen up the stock suspension during regular street driving and are a great alternative to the expensive race coil over. How do you tell whether a high flying Hellcat is running our drag springs? You can't!