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I got the Perrin CAI kit plus their intake hose during a Black Friday sale at Rally Sport Direct. I was previously using the stock airbox with a K&N oiled filter, and had a Vishnu Stage 1 1.34beta tune on the car for both the filter and the CAI. No MAF issues and I didn't have to do anything special to get rid of a CEL.
I don't have access to a dyno so I have no idea what gains, if any, the filter or the CAI made over stock. What I can say is that between removing the airbox and the piping for the sound generator there's a ton more space in the engine bay. And the induction sound produced by the intake is incredible. I don't care about any theoretical HP gains.
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Perrin CAI + intake tube || Tomei UEL || OFT Stage 2 tune
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