i ran forge DV. They provide 2 sets of the spring. I use the harder one. Because i am running Cobb stage2 + FMIC. Honestly i have not got any differences feel vs. previous Tial Blow-off. Once i got dynoed and then post the result.
1 M Coupe AW,
AK evolution, AK DP, GurppeM CAI, ER CP, Cobb Stage2+FMIC, ETS FMIC, KW DDC, Brembo GT,