Cutting the pigs will not make it any louder....just a bit lower tone.
Now that you've started the journey of hacking up your pipes, if you want louder the next step is to drill the baffles. That will make them a little louder, but not by much.
If that doesn't do it for you, the next step is the Ragnar cut. That will get you loud.
If you want more info on the what and how to of the Ragnar cut, I can post some links for you if you want. It also includes instructions for drilling the baffles.
After you do all that, I can provide some tips on how to make them quiet again.
