The modified one has a brass sleeve and runs a flex shaft, a stainless intake grill, integrated water pick-up and it comes with a precision motor coupler to suit whatever size motor shaft you are running.The benefit of the flex shaft is that it's a snug fit in the brass sleeve so there's no play. The outer winding of the flex shaft acts as a screw pump which, combined with the snug fit means that there's no water ingress through the shaft bore. The flex shaft is exposed between the motor coupler and where it enters the jet body, this allows it to act like a double universal joint and compensate for any misalignment between the motor and drive shaft so you get maximum energy transfer from the motor to the impeller.It will drop straight into the NQD hull as it is a genuine NQD unit that I've modified.Here's a link to the listing for it in my eBay store where you can see some detailed pics (
http://www.ebay.com.au/itm/Modified-...item27d04280f5)