The pureone i used in my moms car is restrictive on my moms mercury grand marquis. I know this for a fact.
Here is how i know, My mom lives near a lightly traveled newly paved road i stop at one point and punch it with the traction control on so the wheels don't spin and i don't let off the gas until i hit where the speed limit 50 sign is and there is always around a 10mph difference in speed every time. With the motorcraft the speed is 84-86 with the puerone its around 75-77 The pureone robs some horse power although im sure it cleans the air very well and mom never punches it anyway so i guess its ok. I did four runs two with each filter all with qsud 5w20. Just my opinion no special equipment used.
Both filters were brand new at the time of the test ( i brought the pureone back)