I am running a C3/Avid D&R on my 11 Pro and have nothing but good things to say about 'em. Customer service is excellent and the product is top notch. As far as handling, I can't answer because I did a lot of mods all at the same time including a VanAmburg tunnel and running boards. So handling changed some but not sure what did what. Gearing down and installing a 163 CE 2.5 (stock was 155) had a lot to do with that also. Not sure what your budget is, but I wouldn't spend my first coins on a belt drive. I would imagine there are other mods on your wish list that would be more cost effective, but if you have the budget to do it....go for it.