I modified my Schumacher's myself. It was very easy and only cost me around 30$. It would have been a lot cheaper if I hadn't had to order in a J tube which cost 14 bucks to buy and 14 bucks to ship.
IIRC,Schumacher recommends the modification be made by Accurate Exhaust Products. To do otherwise will most likely void their warranty. Most of us do not possess the skill, tools and equipment to do the modification. rklein, I remember seeing a post here not long ago showing the modification made to a Schumacher drivers side header, it was a very nice job. Was that yours?