I decided to do the hole saw mod on my 2003 750DC and I was quite pleased and surprised at what a difference it made. I like the new louder, but not obnoxious, lower toned exhaust. Its hard to explain, and the audio track on a video I took does not do it justice. If I had to describe it, I would say it has retained some of the stock pipe Honda fast rhythmic sound but the pitch has been replaced with a deeper, medium volume rumble. It sounds great at idle and gets better on acceleration. My best estimation is that its 125 % louder without the resonators. The mod did not effect performance and I did not make any idle or carb adjustment. It was quick, easy, and only cost the price of a new bi metal hole saw. $17.00. If your wanting your bike louder and sounding a little tougher....do it. I'm glad I did.