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      08-07-2012, 09:36 PM   #2
Major General

Drives: 325xi 06 wagon MT
Join Date: Jan 2010
Location: Santa Cruz, Ca

iTrader: (0)

That is the preferred way to do it.

What you put in will depend on which of the three systems offered
is in your car and if its a coupe or 4 door . It has nothing to do with the Head Unit name. Read the links to find out what you have.

The base system requires processor or frequency flattening device
The middle system called Hi Fi is easiest to modify
The L7 called the HK or Top Hi Fi is more difficult to modify because
of the fiberoptic connection between the amp and head unit and the number
of channels (9).

BMW stereo types

The difference in sound will depend on what you start with .
It will be big for the first two systems and better than the Top Hi Fi (l7)
but it won't be cheap because almost none of the normal Hi Fi
shop stuff fits . The stuff that does fit is really good but not cheap.

Last edited by ctuna; 08-07-2012 at 11:16 PM.