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Category: Car
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Experience:  25+ yrs experience as a professional working technician; ASE L1 master technician
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1993 325i: 2.5L..new one, it sounds..is it the catalyst converter

Customer Question

i have a 1993 325i bmw 2.5L and the exaust sound is loud and i get alot of sound inside from the exaust, i replaced the rear muffler with a new one, it sounds different but still loud. is it the catalyst converter or did i get the wrong muffler, i want a quiet sounding muffler..
Submitted: 11 years ago.
Category: Car
Expert:  Steve replied 11 years ago.

 In my experience, most aftermarket mufflers are much louder than the OE ones; that is one reason tehy are usually cheaper.  


   A failed CAT can contribute to noise, but usually will also have a rattling noise from broken internal ceramic bouncing around inside.


   A vibration or resonance coming through teh body may mean that a component is touching the body somewhere from misalignment or worn hanger(s).


  If the sound is louder than acceptable at teh tail pipe, however, teh cproblem is a cheap/ faulty/ performance series muffler.


  For original quiet operation, OE BMW parts are the only way to go to be assured of factory sound. 

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