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Is the OEM Infiniti Sport Exhaust (sells as an aftermarket swap-out from dealership) an option? I don't know is they're any good or would fit your needs.
I, too, am looking for more growl for less money since I lease, and have to be careful that what I put on the coupe can be taken off in 36 months...
I don't know the difference between the sport exhjaust but mine doesn't have any options like that. I love the sound of the oem and don't want to change it, just want it to be more v8 sounding and deeper.