So as some of you know i've had my 03 350z touring for the past month or so. I put a K&N drop in on it, and it has a newer design intake tube? I don't know about the tube.. I was told that when I bought the car. Anywho, I ordered my 5/16 isothermal plenum from motordyne a week ago or so, I installed it yesterday, and I also did the DIY oil catch can and installed that as well; both were a success! I couldn't find the exact "cat can" part, so I compromised to something similar. I have a few pics of the plenum and how dirty it was before I cleaned it and some pics that I took along the way. Tell me what ya guys think!
Upper Plenum Removal, a little antifreeze leaked out of a tube I unplugged:
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Lower Plenum Removal:

Cleaned out the upper and lower plenum and reinstalled after thermal gasket installation:

Oil Catch Can, I scraped the strut bar a little bit zip tying the can:
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Finished!:

Car runs great, a little deeper sound with the spacer, and slightly noticeable pickup especially towards the mid to end rpm.