Another vote against the Shockwaves. Maybe the Collector or save some money & check out Hooker. Their Rebels and Fourbidden4-1 have that hotrod look to them http://www.hookerpipes.com
Not only does it look good with the BSS but those pipes have the power chamber and actually work about as good as a 2-2 system can. I just ditched a set of standard big shots and bought the BSS for my Train and gained a heap o' power. The power chamber and stepped pipe design is a good thing plus the V&H quiet baffles are available which make a nice deep rumble.
Your bike looks badass as it is. Spend the money on some head work instead!