I guess no more advice???
This is a discussion on 2002 Evo 5 not boosting properly within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I guess no more advice???...
Well, we can only speculate without actually seeing the car. Sounds like you'll need to take it to MRT or some other professional to check out at this point.
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It sounds like maybe your mate tossed the restrictor pill when he changed that line.
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