bro, to produce the sound that the Fairlady Z and G35 make, you'd need a v6 engine, which is what they have.
in terms of similar sounds...the TRD
exhaust is your best bet. highest gains and quiet"est" sound.
TSRM with silencer will still sound like a fart can. all of the exhaust with silencers will.
except for TRD
, because its...well TRD
the tribe has spoken, go get a TRD