Stock Exhaust with about 1000 miles 614 kb WAV file

Phase 1 - after removing the little screen from the end of each baffle 765 kb WAV file

Phase 2 - step 1 - 4 holes per baffle 862 kb WAV file

Phase 2 - step 2 - 8 holes per baffle 776 kb WAV file

Here's a picture of the finished pipes so you can see how I preserved the slashcut.