i think what he means not a nessesary V8 sound, but that deep burble that they make. with the V6 its easy........ and possible with a I4.
big bore exhausts are generally give the deepness, but are loud and can cost you power(NA), nice oval Muffler will add some deepness too. the burble is going to have to come from the bends that are in your system, generaly the straighter the exhaust the more 'screamy' it will be.
even with my NA F2 no muffler just a 45-60 degree bent dump pipe(where muffler was supposed to be) i got asked many times if i have a V8 or angry V6 in there . granted the thing sounded like a big engined tractor at sertain RPMs and loads, but id did had the burble...... no deepness though, stock 2-2 1/4" crash bent piping didn't give it
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