I can’t find anything recent or any shop selling a stronger spring that I can put in my bpv. I have had a Detroit tuned one in my old r53 and loved it, but this build is budget and I have a spare valve I just cleaned up and took apart. It has good closure and spring back already but I want to put in a stronger spring, which seems impossible to find now. Worst case scenario I’ll use something like a washer to make the stock spring preloaded more just to see. It’s hard rationalizing paying 15% of the car price on a bpv when I have two functioning ones, however, mini….