328i have crome tail pipes , and 325 have no crome tail pipes , as for 318 i single tail pipes ,
another way is to see the fender signal light for 97 below the 325 and 318 their light is bigger , similar wit the e30 fender lights . 97 above 318 and 328 their fender signal light looks like or same wit the e46 fender signal light , i belive tht cannot be change ....
this is my observation so far....
correct me if im wrong ..