G19 dip stick oil drains.
 

Has anyone used one if these?

http://www.g19engineering.com/view.p...duct=70&page=1

Or see any reason why it wouldn't work?

HKS kit came with a setup like that and it sucked dick.

Way too small diameter.

I have used a modified HKS tube (lowered oil return to tube connection for low mount turbo) for over 4 years on a daily turbo with no issues.

Oil flow is very low on the restricted inlet BB turbos. So diameter should not be such an issue.

you'd be surprised how much oil is still actually flowing through your turbo, even just at 15-30psi at idle; restrictor or not.

You're asking for nothing but trouble with that oil drain.

What I did on mine was fit a cut off spare dip stick handle so as not to restrict the return to sump further.