First thing you do.... NEVER listen to people at Circut City. They are MORONS.
Yes you can have aftermarket HU with the Mach system, but you'll need a HU interface adapter (about $65 bucks)
On a side note the Mach 460 sucks ***. So much, that my brother and I ripped the Mach 460 out of his car and installed all new stuff.
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1987 Buick T-type
1998 HD Electra Elide
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