ovals are physically larger with more packing in it. the sound of the "same" type would be marginally quieter. i would give you a sound clip but its pretty in audible. however i do have something...
all i got, its pretty crappy, it was more to show off the HID's lol.
V6 or not, you see a camry with "LE" on it, its either V6 or i4. doesnt really matter.
if you wanted to hold true OEM styling, you wouldnt throw on a 4" tipped can lol
The dual tip is the truest ive seen in awhile.
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however the 4" tip oval one isnt bad if you want to save some money.

thats damon's old car.
or for shits, this is straight off the turbo