Ditch the K&N, they are bad for turbo diesel engines, they can dust em.
Also I would ditch that hypermax chip and get some custom tuning, that hypermax is not doin much at all for you right now
The ATS housing just helps with spool up
They dont make body lifts cuase the arent a good idea to do on diesels
For a good injector upgrade check out this site DIY-Injectors.com
he has done injectors for me twice for a great price and service