I'm in the process of fitting a K24 turbo kit but I'm having to replace the Sard C-2 wastegate. Can't find a second hand one for love nor money so rhdrivejapan are my only choice, trouble is I have 2 spring options, 0.5 or 0.8 bar. Engine won't be forged for a while but will have a good electronic boost controller fitted. Which spring do I order?