This DIY is only completely applicable for cars with the M370 Intake Manifold and a relocated battery. The Motordyne M370 tees our engine's two PCV lines into one hose run (making it simpler to use a single can), and a relocated battery leaves a nice empty heat-shielded area to mount a relatively large and well-built can. Being in the relatively-cool battery box area has a side benefit: the cooler you keep the catch can, the better it condenses the oil vapors.
The catch can I used is
this one from Elite Engineering. It's made for a C6 vette, but that's really just about the the mounting bracket they ship. It's a very high quality can (to quote their site: "The 2.6 inch diameter by 6 inch long body is machined from billet 6061-T6 aluminum alloy, and then anodized"), and it has nice internal baffling to help condense the oil. It's a little bit large for fitting in the edges of our engine bay normally (esp given that you unscrew off the bottom 2/3 of the can to empty), but it fits just fine in an unused battery compartment.
All pics were taken after the install was mostly complete.
This is the spot where the M370's hoses tee our two PCV lines together in the front. The hose taking off to the right is the factory PCV line to the driver's side valve cover, and the lower left one is the PCV line to the passenger side valve cover. The upper left one goes around to the rear of the manifold in the default M370 setup. We'll basically be splicing into this upper left line to insert the can, from a hose-connection point of view (actually, you'll probably use the whole original hose to run to the can, and the new hose shipped with the can to run from the can to the rear of the manifold).
For mounting the can, you'll want to find the highest and rearmost flat spot on that wall (it has some curves) beneath the hard brakes lines. You want to drill your two holes 5/8" apart center to center. Use a hacksaw to cut off most of the original C6 mounting bracket, leaving behind just the little aluminum piece with the two small bolt holes, and bolt the can to the wall here using the supplied bolts. Before you do any cutting, make sure you've left barely enough room to remove the bottom of the can for dumping oil when installed.
Update: When I was re-doing the hoses for this (after swapping manifolds a few times for dyno comparison), I realized the hose routing would work much better if I swapped the two screw-in fittings on the can opposite from how they shipped them:
I also took a hacksaw to the edge plastic for the battery area to make a little opening to route the two hoses through (remove the rubber seal first, you'll want to lay that back over the hoses when you're done):
When you're done, you should be able to put the rubber hood seal and battery compartment cover back in place, looking about like this:
