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I just got my Highflow kit installed. Have yet to do a dyno and will post a report after that. Should be sometime next week. From what I observed during the installation, it was a real PITA to remove the stock air box. This is necessary for the Highflow kit but since the Quickflow system uses back the stock airbox, you may not need to go through this.
In my opinion, there shouldn't be any downside to the Quickflow change IF you retain the stock intake filter. There are still some arguments that the oil in the K&N will screw up the MAF. Porsche Club of America said they've seen enough MAF screw up without any aftermarket oil filters installed though. They've since taken a stand that the MAF problem is not attributed to the oil coming from the K&N filters. I've taken the leap of faith in my case and went the Highflow route.
The cone filter definitely offers better air flow compared to the stock paper ones. However, the stock air box offers 'slightly' better thermal insulation from the engine bay heat. But only slighty.... I've the before and after figures on temp rises/drops that I'll include in my report.
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