You tube has quite a few threads to listen too. Just got my stryker two months ago and the sounds needs to be louder. Cross between drilling or purchase...
Let me go ahead and tell you what your gonna do. You'll start out drilling two holes in each pipe, add two to each pipe, make them bigger, order aftermarket, never be happier.
This will happen in less than a 45 day period. Just skip all of the drilling and just order the exhaust you want and save yourself the time. You'll get the sound you want 30 days sooner.