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Radio upgarde?

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I wanna replace my factory radio with an Alpine IVA-D300. But the MOST bus is not compatible with the alpine radio. Also can the amp in the trunk be removed if I changed the radio?

I heard the factory alarm is tied into the MOST bus, is that true.

What kind of modification I can do with my audio system?

Many thanks,


03 Boxster S

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Try the Becker board. If you take all the MOST components out then it should be like any other car, except I think there is an issue with the ignition trigger line and maybe the a/c display. Karl on this board went through some of this. I would have to ask Peter if you can turn off MOST with the PST2.


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I am running an alpine cva-1004, 2 8" bazooka tubes in the rear trunk powered by an alpine amp I mounted in the front trunk. I installed BM quart 4X6 coax's in the rear storage and made self made speaker fabric grill, looks sounds like factory, wired them directly into the factor amp, that still powers all the door and dash factory speakers. I also took out the cd holder tray on the dash and mounted an in dash DVD player. All in all, I am impressed with the sound. The front speakers sound very well and with the addition of the better radio, they sound much better, the 4X6 in the rear fill out the rest of the car well, and the 2 Bazooka bass tubes sound pretty good even thought they are mounted in the rear trunks and have no ports to bring the sound up front. I am impressed. I have run the bass link on the radio up to max and adjust between 70mhz and 90 mhz. It;s funny when other boxster owners hear me coming and cant figure out how I have that sound coming from my car.

BTW, hacking into the amp with the speakers from the rear and then hacking into the wiring for the amp with the aftermarket so that the door speakers work, was obtained witht he help of crutchfield tech's.

Also, If you dont line the bottom of the radio, with electrical tape it will set your alarm of randomly, I was told by the dealer, that metal of the radio touching some sensor made it go off. So I was told to electrical tape the bottom and voila, no more annoying alarm going off randomly.

Hope this helps.

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