Rotor Question S4 Or S5
 

I have a 13 b six port that a friend left in my garage that needed apex seals and he did not know what year car it came out of i am wondering how to tell what year the motor is there a number on the rotors or do i just need to weigh them

The s4 intermediary iron will have a EGR valve on it.

13b apex seals are 13b apex seals, they're the same. they differ only of what they are made of.


please search for how to tell what motor you got, covered too many times

s5 has knock sensor on the housings