Because they generally exist in movies and the USA, "street racers" in the uk are usually kids hanging out in the local car park revving their engines and adding flamer kits
You forgot the boogy woogy boxes that they call "subs"
DONT BE DISSIN BOOGY WOOGY BOXES A'RITE! should hear mine isn't it, my roof and everyfink rattlez iz well gdz!
Back into English mode, one of the guys I used to go to college with had in the boot of his 25/ZR replica 2 1500w subs, with them on 3/4 volume with all windows and doors shut I could put my iPhone on his roof and it literally bounced up and down a couple of mm. but it was about a week after everything started to rattle and he took them out in the end.