2007 Focus sub and amp fitting

[deesun]

Today I rang a mobile fitting service as I want an amp and sub fitted to my daughters car. He didnt know the Focus and wasnt sure if the correct din plugs allowed for correct fit or if he had to muck around. Nor was he sure if the head unit was easily removed or was built in like B series Falcons. As I didnt have the car here I said its just a head unit unlike ICC. I dont think he was after an upsell but he sugested to replace the head unit and even $100 Supercheap head units would offer better sound rather than factory. Currently I would rather just do the sub and amp. Can anyone give me some clues please.