does anyone make hi po valve springs besides jwt

hi po. you mean aftermarket? there are a lot of companies that do. and dont ask which are the best ones. greddy springs are like $150, Jun GTiR dual springs are in the $400-500 range plus retainers, another $700... depends what you want. search around a bit on here and google

Try running a search on COMP/CAMS valve springs, I have read and heard a lot of good thing's about them. I had a set myself but, sold them off before I could install and use them in my SE-L. I hope this help's you some...