Built-in,4Channel Hifonics Son of Europa, Monoblock X-Pulse500.1(small and strong), 12″Sub Hifonics ASX as well as a 1F cap and the switches of the FS system, all in double ground! The spare wheel flew out and it was space for my 45l bass reflex box! For cooling is an 80mm Pope fan! Extremely quiet!!! But still enough conveying performance! As front system serves a Hifonics Atlas ATS6.2C! Has been installed in the original places! Radio is a Pioneer DEH-P 9400MP! Gimicks are a Brax-V control as well as the illuminated interior of the 4channel with engraved plexiglas panel! Doors and trunk have been insulated! A 50mm2 is used for power supply, completely laid in braided hose! LS cables are all designed in 2,5mm2 and have been laid with the chinch cables through the middle tunnel!