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LOL - I believe you are correct stage 1 is NOT a jb4. More of a jb+ , simple boost controller. The stage 2 upgrade is the jb4 or maybe the simpler jb3 in jb4 housing. It's pretty rough to install because it's not plug n play. Comes as a pin out installation, so not to many people are gonna be willing to do that. That stage 2 forum has most of that info, and most of the guys are running stg 2 on 550s.
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