You won't need a flash with the 13 head unit. That only applies to bikes with the rushmore head unit (14 and up). If you want some input about the JBL 638s, find @Swomack on this forum. Dude is SUPER helpful and won't steer you wrong. I don't have any experience with those speakers, so can't say much on them, but I know they will fit in the speaker pods with no issues. You will, however, need to buy speaker ring adapters since those are 6.5 inch speaker and the stock is 5.25. Sound Stream is a good amp for those wanting to save money. I'm running one now, and will purchase another this spring when I bump up to an 8 speaker set up. The Picasso Nano is the best bang for the buck lineup they have. You can find those amps on ebay for right around 100 bucks all day. You will need a line out converter so you can connect your stock head unit to the amp (link below). If anyone else has a line out converter that is better than the one I found, feel free to chime in.
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2013 RGU BBP. Detachable Tour Pack, aftermarket slip ons (no name), Wild 1 WO612s, Avon Cushion Grips, 13" Madstad, Kenwood Excelon x799, 8x DD Speakers (4x VO-M, 2x CXS 6.5, 2x B3), Diamond Micro 4v2 Amp.