audi b3/b4
#2
b3 and b4 is the body style.. i dont know what years those stand for.. but i have a b5 s4.. it is a 2000 and i think it was still a b5 till 03?? maybe 04.. but the next body style was a b6.. and then b7 and so on
#3
b3 was basically the a4 from 1988 to 1992 it had either a 10v I5 or my favorite a 20v I5, from 1993 to 1995 it was a slightly revised B4 model which was more aerodynamically pleasing, then came the B5 which was changed from audi 80/90 to audi a4 and later S4/ and RS4. that boddy style remained from 1995 (europe) to 2001 for the a4 and on til 2002 for the s4 variant.