5th Coil Spring?

[crew21L]

Just curious what spring everyone has on the 5th coil. We are running either a 300, 325, or a 350.

[billetbirdcage]

A 300 to 375 is the most common, anywhere in that area is a good all around starting place. You will need to test to see if you need more or less, don't go by feel. Test on a consistant surface and use lap times.