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Message: <blockquote data-quote="E46Fanatic" data-source="post: 221592" data-attributes="member: 81">For N/A chipping alone won't yeild significant HP and Torque gains more so for engines already producing high HP/Ltr ratios (i.e. they are already quite efficient).  Once you start playing with bolt on mods, like intake, catback exhaust, etc then a custom map which is tuned for the new bolt on mods might yield a slightly higher % of gains.   I think a good performance potential gauge for the BMW 2.0 4 pot N42 engine would be what BMW has done with its successor.  Essentially the same unit except the Valvetronic head is repalced with HPI, Siemens precision injectors, with new ECU management etc.  Don't know if BMW went and optimized things like headers, intake, exhaust as well, but the new engine puts out 15 more hp than the predecessor with all the R&D and technology put in.  So... unlikely that a simple ECU map on the 2.0 N42 valvetronic will yeild the same amount of gains as what all these German engineers painstakingly went through resulting with the additional 15 hp gain heh.</blockquote>