Go with an eBay axle back if all you want is noise. Axle backs don't add performance(it might but there is no definite proof) so if you are gonna get one, might as well have it cost as little as it can. Axle backs can be found for under $200(search G37 axle back not 370z, same part with a lower price) on eBay.
I have seen one on a 370z today and it doesn't look or sound bad.
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SOLD 370z
New Car:classified
DD:2011 Mini Cooper S stock
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