Sorry - I've been slammed at werk. I know when I researched it a few years back I found some specific vendors dedicated to subs for the Z3. They were 8" and fit in a pre-fab kit between the seats/rollover protection bars. They were jar about flush and allowed the boot to be put on as designed. The only thing I didn't like about mine is the shop put my custom box in and you have to clear it from getting in the way of the top going down and the boot cannot fit on anymore. There is an extra 4-5 inches so this wasn't necessary and bugs me for what I paid - lots more than double your quote - but I also changed all the speakers out, had a 700 watt power amp put into the trunk (not much space lost, but not as nice as some of those below the floor units I mentioned before). I also of course did a new nice head unit which they really set up for me - crossover, time correction, I-link to control the sub directly, major EQ, etc. It was a real challenge as there is really very little space to work with and I too did not wanna lose my trunk. I know the tech who built it (under the guidance of the well known guy who owns the shop, who planned it all after I told him what I wanted.
Boy am I glad the one I build for the M3 (Harmon-Kardon) in there as first owner took out the wall of subs and flip out screen, DVD, etc. to sell separately. I admit I'm looking forward to having waay more space to work with...
2008 ///M5 with Eisenmann race exhaust "Athena" 2013 VOLKSWAGEN Tiguan 2L Turbo RIP 2005 Dinan ///M3 S3-R+ Vert w/hardtop
- 6-speed, DINAN SC - race kit, race headers, etc. RIP 2002 Z3 Roadster 2.5i - VF Supercharged
, 5-speed, Brembos etc. Turkey ///M Car Fleet Commander
TINA FAN CLUB PRESIDENT