It sounds like you mean a subwoofer amp not a head unit.
Any amp even the optional factory subwoofer will still require you to run thicker power cable to the battery.
This is not as hard as it sounds. It just takes time. Look up YouTube vids on amp installs.
Buying a plug and play kit makes it easier and faster to install.
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New daily driver - Subaru BRZ Premium
Weekend fun/track car - '91 MR2 Turbo Gen3
Old daily driver - '88 MR2 Supercharged
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