; Provides springs of various rates to allow the racer to custom tailor the vacuum secondary opening and closing rate to best suit their combination; Contains seven springs color coded from light to heavy; Instructions included*Not legal for sale or use on pollution-controlled vehicles
- Has springs of various rates to allow custom tailoring of the vacuum secondary opening & closing rate
- Contains 7 springs color coded from light to heavy
- Instructions included
- Not legal for sale/use on pollution-controlled vehicles.