Depending on the size of the sub you may be able to get a powerful enough multi channel amp to run both the components and the sub ie. Alpine PDX5 but like I said that depends on the size and power needs of the sub you intend on getting.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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