| Rasp is not what is commonly known as the "sound that comes out of the exhaust".
The term "rasp" has been used in regards to the E46 M3 to the often times called "tinny" or "clanging" sound of the E46 M3 stock exhaust system.
It sounds as if you are just looking for a louder exhaust, not an exhaust that provides more rasp.
Eisenmann, SuperSprint, Dixis, and B&B Triflo are a few of the more well-known exhausts out there for the E46 M3.
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