My 8000 mile standard air filter cartridge outflows a new green cotton panel filter by about 5g/sec. It also outflows a dynatwist too. I'm going to try a large open filter next.
I wouldn't go by that tbh.. I've just replaced the standard panel filter on my 225 LCR with a BMC panel filter and I've noticed the smallest amount of extra pull when giving it some beans. Not a massive difference but defo better than standard, sounds beefier too