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I don`t know much about aero mods, but 325s came with heavy slabs of stuff on the trunk floor, which are good candidates for weight reduction if you don't need it for traction. Also, there may be a slight gain from running without the power steering. I drove an e30 for several years without the PS and didn`t have a problem with it. Lastly, don`t forget the basic tune up stuff like plugs/cap/rotor/O2 sensor
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