Internal wastegates or external for that matter cannot be set to run a lower psi than the spring installed.
I would reccomend going with the lowest psi spring available and getting a cheap manual boost controller to adjust to your desired setting.
damn Eric I never new you were so turbo savvy <img src="#/f/iB_html/non-cgi/emoticons/laugh.gif" border="0" valign="absmiddle" alt=':laugh:'> Kudos!
I'll declare you king of all turbo theory if you can make me a compressor map for my 2540 <img src="#/f/iB_html/non-cgi/emoticons/laugh.gif" border="0" valign="absmiddle" alt=':laugh:'>
Jed