dmdc411 wrote:I have a '05 F150 with the 5.4liter, I put a Flowmaster on in place of the OEM muffler, sounds awesome, but thats it. No change in MPGs, it may have a hair more snap, but don't notice it. The K&N filter, would not recommend it on anything other than a carb'd motor. Have been told by 3 auto mech friends the oil from the filter does mistify itself and will get on the mass airflow sensor which is heated on most and will cause it to fail. The possible repair cost makes it a no brainer! So, if anybody wants a K&N filter for 05 f150 5.4, maybe 20K miles with a fresh recharge, send me prepaid ups label or what ever and you can have it!! Dave
speed desnsity type EFI systems do not use a MAF...I still would not use one...cleaning the MAF isnt too big a deal
