The response is there which is what I was after, as I said in the post not so sure about the gains, I wouldn't suspect much if any. I have K&N on all my other cars with no issues (including my previous car which was a Supra with a single turbo)
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Chris 
Current: 2014 WRX Stage I + SPT / 2013 Hayabusa 202HP
Former:09 370Z 7-AT PW/Ark Type 2 exhaust/Evo R lip/TSW Nurburgring carbon
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