I agree, try an aftermarket head unit. Look for those that have a higher pre-amp voltage. Most come with 2v pre amp outputs, looks for those with 4x or higher. This will clean things up even more. If that doesn't do it for you, that just means you need to swap out all of your components! That's the problem with the audio builds, they can get pricey if you don't nail it the first time!
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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.