The amsoil filter in those tests don't exist anymore. They've gone to a synthetic media:

 

i would say efficently high 300's low 400's at most but ther is guys that hit 500 with a crap load of fuel, dangerously high egts and the risk of killing your turbo.

 

yes i was putting 425 to the ground EGTs are scary pushing it now i have bigger injectors and a lil more timing and hoping to be close to 500 but not dynoed it yet. but about to be running a turbo off of a 3126 cat. i think this will help alot

 

if you get to high on boost get a set of studs. watch your guages when you start running that much