someting like this?
http://www.e90post.com/forums/showthread.php?t=1294594
Personally if you want to tune I would avoid the 325i entirely and either go with a 330d, 335d or a 335i (personal favourite is the last one
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2016 M140i
07 E90 335i: JB4, Trebila BEF, BMS DCI, VRSF DPs, Scoops, 19" CSL Reps, 5" ETS FMIC, VTT Inlets, BMS CP, HKS BOV, BMS Meth Injection - sold