From what we've seen at here Perrin fitment is hit or miss. Sometimes they work fine but most of the time they need to be "massaged" in. If you can find a longer metal pipe to extend the re-circ valve connection. Again not the best but it will work. We recently did an AVO inlet and while it fit better there are still issues. Overall no after market inlet fits like they say it does. I've done APS, AVO, Perrin, Samco, Agency Power, and a few cheapos. They all have their quirks.
-Jake
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