Not really, other than a recording and a big pair of speakers.
The characteristic sound of a V-8 is due to the cam timing of the engine
which can then be acoustically "tuned" with different exhaust components. A
six cylinder, straight or "V" just doesn't sound the same. Even a V-10 and
V-12 is minus the characteristic timing sound of a V-8.
I don't think you will get the sound of a V8 by changing the exhaust.
Why not optimize the sound of an E46 M3 with one of the performance
aftermarket exhausts made for it. (Kreissieg or similar)
Of course, you could always trade it in on an E90 M3. It *has* a V8!
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