Some information for anyone who is interested:
So I did poking around McMaster's site and looked up the chemical compatibility for gasoline for the O-Rings they carry. So Buna-N has a rating of "good" when it comes to compatibility with gas however Viton has an "Excellent" rating for gasoline. I ordered a set of these Viton O-Rings, they are like $6.00 each O-ring versus $8.00 for a bag of 25 however the cost is worth it if they don't break apart like the Buna O-Rings. My concern with the Buna O-Rings is getting something that broke off sucked down into the engine. The Viton have a slightly stiffer durometer rating and I feel that will also help seal to the throttle body better as well. I currently have them on the car, no vacuum leaks around the O-ring; I guess we will see how they look after 20k miles but I know the Buna's looked like crap after less miles than that.
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2014 370z Touring Sport, Stillen supercharger, cat-back and oil cooler
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