looking for more info on stcok HU radio swaping. my 2004 V70 has a HU-613. will a HU-803 also out of a 2004 V70R plug and play in my V70?? is there anything else i would need to make this work??
That is correct. 803, requires an external amp. The good news is that it will work with pretty much any analog amp and used Volvo amps are readily available too.
I replaced the 613 in my car (04 S60) with a 803 from a 04 V70R a few years ago. It was plug and play as far as the integrated steering controls, dimmer, and display read outs. I already had an external amp though.
found this info from the link...
(((yes it is possible to put in an 803. Did the same on my car (04). They come up in the classified ads here (swedespeed) from time to time.
Note: you will also need to find an amp to go with it. The 803 does not power speakers directly like the 613 does.)))