When I had my Extended cab 2003 GMC Sierra, I had one sub underneath the driver's side rear seat and it sounded alright. Bass is non-directional and ... you're the driver, so you should enjoy it more than anyone else
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (
link)
I can't check the forum daily. If I don't reply to you within 24 hours,
drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.