my car is currently equipped with a billet aluminum turbo from Precision. i got the 6262 T4 w/ .81 A/R. from what i hear billets spool up pretty quick and that Garrett has jumped in with this new tech as well.
if you go single, maybe you should look into them. as for myself, i havent seen a difference yet but thats because my car isn't ready. if they spool up faster i will be sure to post about it
