There are many different ways to do a "catch can" setup on a Miata, which leads to a lot of confusion on the topic. Hopefully this clears some things up and helps you figure out which route to take with your build.
Edit - Since I've received multiple inquiries about my flannel, here it is LOL https://amzn.to/3lcbCRy
Seriously the best looking and most comfortable flannel I own.
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Parts Used/Mentioned:
3/8" NPT Tap Set https://amzn.to/3mpch16
1/2" NPT Tap Set https://amzn.to/2ZVDZuX
Evil Energy Catch Can https://amzn.to/3isZJEO
Mishimoto Air/Oil Separator https://amzn.to/3oucRgN
3/8" NPT - 10AN Fitting https://amzn.to/2YfpmSU
1/2" NPT - 10AN Fitting https://amzn.to/3iuW1KW
10AN Hose (5 feet) https://amzn.to/3F9cWwp
Testors Red Model Paint https://amzn.to/2WB4pkg
VHT Wrinkle Black Paint https://amzn.to/3mm3Cwr
CitriStrip Paint Stripper https://amzn.to/3a2oYcr
SPS Motorsport Vented Valve Cover
https://sps-motorsportshop.com/shop/en/part-shop/performance-parts/mazda-mx-5-nb-1999-2000/enginebay/1-6-l/equipment/2584/valve-cover-kit-for-turbo-engines-mx-5-na/nb/nbfl
Mazda 323 GTX PCV Valve
https://treasurecoastmiata.com/i-23790138-upgraded-90-05-miata-pcv-valve-e301-13-890a-free-shipping.html
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Forum Links & Videos Mentioned:
How to Wrinkle Black/Letter Fill
https://www.youtube.com/watch?v=roV43SQzwGQ
MiataTurbo Catch Can Thread
https://www.miataturbo.net/engine-performance-56/new-definitive-catch-can-thread-99549/
fourwhls AN Fitting Upgrade Thread
https://www.miataturbo.net/engine-performance-56/fittings-your-valve-cover-under-%2440-no-welding-painting-91389/
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0:00 Intro
1:02 PCV Valves, Breathers, & Blowby Oh My
2:27 Why Upgrade?
3:45 Seeing The Parts On The Engine
6:05 Valve Cover Disassembly
6:50 Modification Variations & Explanation
9:18 Breather Passage Drilling & AN Fittings Install
13:13 Paint Stripping
14:51 Kraken Manifold & Can Location
15:35 Catch Can Comparison
16:35 Custom Built AN Lines
17:04 Painting Valve Cover & Lettering
18:28 Final AN Line Routing/Install
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