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All depends on how aggressive you want to be.
14.5psi (map2) 400bhp ish
17psi (Map5) 420-430bhp ish
With a G5 ISO board you could get higher boost but start to risk Knock without Meth. Depends on Octane and environmental conditions too.
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Car: e91 330d with Viezu map
Gone but not forgotten: 2010 Jaguar XFR (Cat-back exhaust, pulley, intake mods and map), Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)
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