If the HKS Super Power Flow's are so shat then home come a lot of the top tuned skylines use them?
I'm not saying all use them but I have seen a good few with these filters. Not just on skylines either. Agreed they may not filter as much as say Apexi but surely the airflow is huge? I'm sure Sumo Powers R34 was running about 850-900 bhp with these filters?
They do the job perfectly for me, I'm just at stage 1 mods so apparent 'restricted airfolw' shouldn't be a problem..
i read a review in a magazine a while back where they tested most of the top brand induction kits for the skyline. the hks,apexi and blitz sus kits all had pretty much the same bhp gain over the standard airbox. as far as filtration was concerned the apexi kit came out on top and the blitz stainless was a close second, both did a fairly good job of filtering out the testers "soot". the hks kit was rated as having "very poor filtration" as it let virtually all the testers soot straight through.
i'm guessing that most of the grit and dust a filter lets through is sucked in and blown straight out again by the engine. but in theory there's always a risk that over a period of time the grit and dust could build up a "grinding paste" in the upper cylinders - meaning you get to fit an rb30 conversion sooner than you thought.sweeeeeeeet
what I know is I didn fit the HKS filters that came with the tubby kit went off and bought a nice pair of K&N and ya I wont bother oiling them just buy a new pair each few months put it down as service charges please