The pipes look great! How do they sound? I went for the 2:1 Fat Cat as well. It shipped today and I am anxiously waiting. I went with the slant cut instead of the back cut because I am planning on extended bags at some point.
I've only ridden it about 20 miles since putting on the pipes due to rain so the verdict is still out on how I like them.
But, at idle and cruise they have a nice deep rumble. No problem hearing the radio at cruise. Barely flick the throttle and they become LOUD and I have the concentric quiet baffle. I'm glad I got the quiet baffle. First time I rode with them I had no tuner. Bike seemed to run just fine. Next time I rode I put on my fuelpak just to see if there is any difference. I couldn't really see a difference in power but I'm sure the Fuelpak has richened the AFR up a bit and will probably run cooler. The fuelpak uses FP-3231 numbers for the D&D's and Ness big sucker. I talked to D&D over the phone. They told me they had about 4 weeks on the dyno testing the '09's with and without a tuner and could never get more performance by using a tuner. They said they had 40 hours on the dyno with the 2010's and had the same results. So I see no reason in using a tuner with this exhaust unless you already have one which is my case. A tuner would only change your AFR. They also said if you make any engine mods, cam, heads, etc. you would definately have to use a tuner. I bought the exhaust for the 'stock engine only'. The hardest thing about the install is putting in the new exhaust gaskets. A very tight fit. Exhaust utilizes the o2 sensors. They come complete with gaskets and all mounting hardware. Very good quality.