I just put a Techno Estoril on my Magnum with the E50 and I love it.
However, the low end so far doesn't seem to be vastly improved. It's when I hit 10mph that the bike finds a new life in terms of acceleration. It increased my top end by almost 5mph. I still run everything original stock - my leaky bing, intake, and filter....and I go 35.
Just remember that you're going to be doing some modification to get a performance pipe on there since the port is angled. I had quite a time chopping, welding, re-chopping and re-welding and making a custom bracket for the back.
It's definitely not easy. You can take it to a pro and either have them a) bend it to fit....or b) weld it for you. Cutting isn't a big deal, nor is the grinding to get the correct angle. It's the left-right angle that's going to get you....and I mean, if you miss by a few millimeters or so, you'll be off by a couple of inches on the back end. So you really have to be EXTRA precise.
Also, I had to take my kickstand off...but that's really only because I have rear rider footpegs and couldn't angle the pipe up any further. You probably won't have that problem.