stripped 2 bolts in the turbo housing when doing DP install, got them out tho so kept my stock turbos :), but was debating on either sp500s or 530BB's tough decision.
thought theres less lag with the sp500s and the sp500s are more streetable/ kick-wise.
the 530 is the champ in the drag run tho. and will ultimately be a tad more powerful than the 500s.
I personally will either go with the sp500s or the 530s when it coms turbo time