Speaking of mileage, does a good honed or edm injector tip give a significant mileage improvement? If your gonna tear into the engine, might as well do it all at once.
Tinman,
In my quest for answers, I came across this post.
PDR cam w/ DD3 injector install results - TDR Roundtable
It is lays out installing injector tips and a cam.
I still haven't been able to find out any info, other than this post, on how advanced injection timing coorolates to advanced valve timing.