You go fast AND you have a loud exhaust AND you want it to rock AND you don't want entry level components AND you want it cheap AND you have to pay for an install AND the max is $600? Not gonna happen sir. I'm not trying to be a smart azz, just being realistic. Here's some options for you.
Can you remove your outer fairing? If you can, than you can remove your gas tank. If you can remove your tank you can install an amp and speakers. Just saved yourself 3-4 hours of labor at a shop.
Look in the classifieds here and the other forum, some good stuff going cheap as guys do winter upgrades.
What you want is a set of DD AW 6.5 with decent tweets (ES9 are cheap) and a JL Audio 280/4 or Diamond Audio Micro 2V2 bridged. Your not going to get that with $600, but it won't be a ton more. If you want to do it once and be done, save up and go this route.
Since you ruled out entry level, the next level up is something like the arc moto 602 or hertz millie 165.3 There's a set of each for sale on hdforums right now, the 602s posted in the last 10 minutes. The moto 602 sound better in my opinion, but the hertz will get slightly louder. Another option is the Biketronics 6.5. I think they're a tick below the arc and hertz, but I have a pair and will let them go cheap. For any of these speakers you'll need an adapter for them in the pods (about $60 from biketronics). DB WDX are popular right now and pretty cheap, but will require mods to your pods which I won't do. If you're comfortable cutting than they're on the table.
Pick up either of the amps above and you won't outgrow them. Lower level option would be soundstream pn4.520D. Won't fit as easy as the others or sound quite as good, but that's what you get on a budget.
You'll also need a biketronics line leveler, can probably find one used or about $70 new. Amp install kit will be around $40 at least.
Good luck, let us know what you go with.
Freedom isn't free, remember to thank a vet.
2018 CVO RG lava orange, 117 Stage 3, 14" F47 and a few chrome extras. Boom crap gone.
2016 RG Special Cosmic Blue, 120ST with Dragos 2:1 and TTS tuner, FBI drop seat kit and JNR air ride. Stock audio long gone.
Last edited by roadie13; 02-25-2018 at 12:24 PM.