Should I hollow it out or leave it stock. I'm setting it up like this.

 

that's how i got mine set up, i posted this on the faq but i love to copy and paste pics so here you go:
This is a DIY oil catch can with a sight tube. who's yo daddy?

this is the completed catch can without the flat black spray paint (it's outside drying now)

catch can with water tubbing for a water dispenser i installed in my fridge.

the top

inside the cc

I made this catch can with a 7 inch long 2" id pvc tube.
It cost $1.30 at home depot, they sell it by the foot if you don't wanna buy the 10ft tube they'll cut it for you.
The top and bottom are caps for 2" pvc tube .88 each.
the fittings are the small vacuume fittings for the oil viewer but i had some and didn't feel like buying 90 degree vacuume fittings so i just cut 2 Ts' and plugged the hole with jb weld.
As you can see I drilled a hole at the bottom of the container after I glued the bottom cap to the longer tube with some jb weld, not a whole lot, just a light film around the inside of the cap, not the tube.
Then I measured how much of the clear plastic drinking water tube I needed after I installed and glued the 2 90 deg. fittings. Put glue in the holes you drilled in the pvc tube for the fittings so there's something in there to seal it, and glue around the outside hole too.
For the top I just drilled one hole 3/8" and trimmed it some so the 3/8" to 1/4" T would fit. jb weld that in there too for a good seal. The top of the T is for a breather or a screen from a dollar store stariner which is what i'ma use. HMT style with a technological twist
I'm not going to route a line to the turbo intake cause that's how we do it in the dirty south Mia biatch
oh, all I paid for this was .88 x 2 for the caps and 1.30 for the pvc tube. and you can never have too much jb weld so I bought some of that too $3.99 I think it was? plus the fittings that I already had, along with the hoses that I had. I hollowed out the pcv valve and glued it back together with jb weld.

 

in the write up it says i left the top barb disconnected on the catch can but when i installed it i decided to connect it to the intake pipe on the turbo. just like in the diagram you posted.

 

The can I already got,what I was wondering is did you use the pcv valve on the intake mani to run to the catch can then from the catch can to pre turbo? and if you used the valve did you hollow it out or leave it stock.

 

i hollowed it out and i sealed it around the edges where it came apart with jb weld. then i ran a line from the pcv to the catch can and another line from the catch can to the turbo air intake pipe. just like on the diagram

 

There's no reason to run that purple line from after the air filter to the catch can. There's no oil in that point of the system.
Run the pcv from the back of the block and the back of the valve cover to the catch can. Plug the IM hole, and plug the hole in the intake pipe, and your done.

 

hmm never thought of doing it this way....I might give it a try

 

they recommend hooking up the purple line so the vapors in the catch can get sucked outta there by the intake tube.

 

Well, than whats the point of the catch can? Part of the reason for installing a catch can is so that your intake air isn't polluted with oil vapors. Now you would be recirculating those vapors just like the original design by honda.

 

I thought it should go to the intake to provide vaccuum to help evacuate the crankcase? (To create vaccuum in the crank case as opposed to simply releasing the pressure.) That was just my impression from things I've read, so I'm likely wrong...