I saw an old listing http://www.zerotohundred.com/forums/index.php?threads/spec-r-%E6%94%B9advance-speed-top-mission-car-plus-initial-d-comic.267127/#post-3434681 and Im currently searching for this...
refering to the question above
isit possible to upboost it to 1 bar with stock internal without causing the engine to blow? http://www.4gtuners.com/forum/Smileys/default/huh.gif