Had a problem with my system after having jump started it. Got a repair guy to look for it and he didn't even charge me which was great turns out it was my amp that was no good. What other amps from any other bmw work On my 01 bmw x5 4.4i hifi dsp ? I want to know any year and series so I can get it and replace mine because it's no good. Any and all replies would be greatly appreciated!!