Kinda Strange, Meny years ago, if you wanted to increace HP the first thing you went for was the restrictive air box. If you made a CAI yourself or bought an after market one. that piece of honeycomb in the MAF was the first to go. Seems like a restriction to me. So with my 07/A6, I ordered my SLP Blackwing and upon installation i riped the honeycomb out of the MAF. All set to go and before you knew it BANG. CHECK ENG. light. Seems the newer LS2s can not compensate for the extra air comming into the motor, Codes read, lean in both banks. Ok, now off to the turner.On the dyno the turner could not keep a good idle and asked what did to her. Told i took the honeycomb out of the MAF and he went YEP thats it. That little honeycomb keeps the air stright through the MAF and with out it makes the air tumble over the senitive wires to keep an idle. Damn, lesson learned. If you want to play, your gonna pay.