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My business is in the same complex as Sideways Audio. I actually had them do some sound work on the Avalanche and they did a pretty clean job. All component door speakers, avic z2 install w/all accessories (bluetooth, ipod, backup cam, etc), two 10" flat pioneer flat subs in custom box under seat, and amps.
I don't think they're the cheapest in town, but pretty professional job.
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Ron K.
XS Power 1 7/8 LT Headers
XS Power 3" Cat Back
Vmax TB
ADM Street Intake
H&R Springs
Forgestar F14s
Tuned by HPT
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