Quote:
Originally Posted by puckshaw
I was curious about this too. I ran HFCs on my old STi and never heard anyone having a failure or even being concerned about it. Either way, I'm going with test pipes but I'd still like to know why it's an issue on this platform.
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The cats on the STI are a lot further down stream from the turbo than on the Z. Heat is the issue, and the additional distance makes a huge difference.