I think the 92 325 does have a resonator because my '93 325is has one and im sure a 92 does too. what does this sound sound like? is it a raspy noise? vibrating sound? clicking? etc? give me an idea and i think i might be able to help ya help. because the resonator is the one thing you didnt look at yet i would look into that then if that doesnt fix it i would say its not fromt he exhaust, it could be ffromt he engine and is just being projected out the exhaust.
if it is a clicking noise it could be comeing from a stuck or partialy stuck exhaust valve or a exhaust vlave with a broken spring causing it to bounce instead off creating a good seal. there are so many things that create bad nioses and so many types of noises that you really need to describe the noise. in as much setail as possible. IM not an expert ( only 16) but ive learn alot form my dad so i might be able to help adn i can even ask him if i dont know it.
92s are naturally loud because of the aggressiveness of the exhaust camshaft. We lack Vanos, so our "hot" cams make up for the needed horsepower/torque. I recommend getting an M3 exhaust. ANSA will still give you a loud note because it's very free-flowing. The M3 exhaust is packed with sound absorbing materials and chambers, which will allow for a more subtle sound.
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