Just depends on how crazy you go.
If you go big, then think about efficient amps+ speakers.
The *Last* time I drove a VW it had a monster stereo, you could definitely tell the difference in performance when it was cranked I'd guess that had something to do with the terrible economy.
Obviously you have to look at average current draw (never displayed) to determine how bad you will hurt economy.
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2012 Tesla Model S P85
2013 Nissan LEAF SV totaled by now deceased intoxacated driver.
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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