I'm using the stock throttle housing.
EDIT--- I just spoke to Larry at Motion Pro, and my cable meets the proper specs... which means that it isn't an improperly labelled 10-3000 cable. I may have to have a custom cable made, I guess...
OK, I'm convinced that I have the wrong cable (although it was labelled 10-3000). I need something longer... The slide is definitely not closing all the way. Not even close. Photos show the cable attached to the carb. Adjusters are in all the way on both ends. One of the slide with cable...
I finally had time to get a photo today... I don't know that this looks any different, but I still don't think that it touches the inside of the stator cover at all....
Installed 2 of these yesterday, both on 2012 300's, with no issue of the center nut being too long. Very easy installation. Test rides to come soon....