i used a new south v1 before and had it blow out on me, i bought it new but off a forum, when i spoke to new south they immediatly sent me out a revised version and never had a problom, even on a k04 at 26psi, and i could always touch if not put my face on the inlet manifold with out any risk but i did have a huge intercooler, but iv had times with a glowing turbo but cold inlet manifold.
so id say newsouth performance as iv not tried any others. this was about 4 years ago aswell though.
Neil