Weren't you asking this somewhere else and answering at the same time?

http://m3forum.net/m3forum/showthread.php?p=4233870

I do not feel that the gains will be worth doing this modification. Do you race a lot with this car or on DD it? My friend is running Meth in his DD and it's a pain in the ass b/c he has to fill it up so often.

I would have gone with a nice nitrous injection kit with 2 tunes, n/a tune then one with spray.

-Ant.