in my limited knowledge of dyno testing, mostly from reading AA's website, standard drivetrain loss for bmw's at least, is 16-17%. Ive found a dyno for a E36 325, with 189hp stock. 189hp * .84 = 158.76 RWHP , which is remarkably close to what AA got for "base" run. The new E46 325 has what? 184hp? Loosing only 14hp from flywheel to rear wheels is insane. Even if it was underrated, which it is not, why would BMW use such a low number? Im not saying it cant happen, i just dont believe your sources are accurate. There is no way that 2.4cyl achieves its torque that low, lower then a I6. Like MrM3 said, i would have to see the charts before i made any final conclusions. Just from reading the topics here, ive gone from knowing hardly anything, to finding out ALOT, thanks guys!
o, by the way, here was the link from AA: http://www.aatuning.com/dyno/94_325i_vs_94...upercharged.asp