The first mod after purchasing my 370Z back in 2010 was two long weekends to install the below stereo system. Sorry not too picture detailed.
Door Speakers with Dash tweeters: 6.5in Kicker RS65.2 with Zenclosure mounts
Rear Speakers: Precision Power 6x9 PPI PC.692 (I will eventually fab customer fiberglass enclosures in the back corner cubby holes) Even though the rears hit hard i keep them mostly faded so the fronts keep the focus. However when volume is desired they come in handy.
Head Unit: Clarion NX500
EQ: Clarion EQS-746
Subs: 2 Polk Audio 12in
Sub Box: Zenclosure 370Z UPFIRE 2-12 (Sealed)
Capacitor: Boss 8 Farad
4 Channel Amp: Alpine PDX-F4 (100 x 4 @ 4 ohms)
2 Channel Amp: MTX TE1501D (1500W @ 1 Ohm) (Gain control mounted in center console)
150Amp DC battery mounted Circuit Breaker