as title does the bose sytem fit into a standard a3 i have the 4 speakers sub amp box an ecu
does it all plug straight in i have a aftermarket head unit ?
No you need to completely rewire all the speakers and run a new loom front to back and new loom from the HU to the boot. The 2 systems are completely different, nothing can be shared betwen the two. Retro fitting Bose is really not a worthwhile upgrade especially if you are using an aftermarket HU.
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