325i / 320i
2.5l engine / 2.0l engine (DOH!)
motronic engine management / L-Jetronic for earlier models, motronic for later models
more powerfull / less powerfull
may have abs in later models / never seen one with abs
comes standard with anti-roll bar front and rear / only comes standard with front anti-roll bar
getrag 265 gearbox / getrag 245 gearbox (i might be wrong here...cant really remember)
other than that it's the same (???)