I have a Pioneer double din head unit. Speakers: Rockford Fosgate Power T162S front components, Alpine Type R 6x9 Subs: Twin 12" Kicker L7's Amps: 1x Kicker KX 400.4 4 Channel Amp and 1x Kicker ZX 2500.1 Wire: 0 gauge throughout Sound Deadening: Dynamat Extreme one all doors, parcel shelf and boot lid Without the speaker amp connected the subs will flex the front and rear windscreen but when its all connected the subs ran out of available power and cut out (Battery and Alternator upgrade were on the cards but now aren't a necessity). if it didn't cut out an could reach its potential it would be 10/10. All up cost no more than $3000 mostly 2nd hand parts I scored cheap PS: I have no boot space and I'm Screwed if I ever get a flat tyre.