Search Youtube for "Harley Exhaust Sound", "Harley Sound" or check the by brand name. I just got Thunderheaders 2 into 1 for the added horsepower, but how can it hurt the injectors?
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It won't hurt the injectors - with free flowing exhaust and a better air cleaner setup(like the popular screaming eagles air cleaner) the bike will run too lean unless you have the fuel mixture adjusted to get the correct air/fuel ratio
Are there replacement baffles for the Vance and Hines? Changing baffles would be the least expensive way to gain louder sound... Typically baffles 2" and over need some fuel adjustment for maximum performance.