I'm going to run the OEM Subaru despite the talk of the blah construction because I've tested it and it does have the right bypass pressure. I will just do shorter OCIs to counter the filter construction but with the 09 WRX engine failures, I don't want to risk my warranty. I have already contacted Purolator/Bosch, WIX and Champion to express my concern over the aftermarket Subaru filters not having the right bypass pressure. So maybe by the time my warranty is up, they will have a new filter for us . It should be easy for Bosch/Purolator since they have the 14460 which has the right bypass pressure...they just have to retrofit that bypass valve into the 14612 (and keep the ADBV) and then we'd be set.
By the way, this is bad news, but the black Tokyo Roki Subaru filters do NOT have the 23.2psi bypass pressure. My Rex came with one on it from the factory and I chopped it up and tested. After 5 trials, it came in in the high 18psi range....so it is no exaggeration that the 'previous filter did not meet Subaru specifications'. To dummy check I reduced the sectional area of the valve by .5mm in diameter (even though my calipers are very accurate to the .1mm (read to .01mm). Even with that, the bypass pressure at highest would be 19.5ish. The blue OEM by Honeywell read 22.7-23.9psi for me using 3 filters and two trials each. My digital scale is accurate to the gram. So if you are satisfied with the black Toyko Roki, then you should have no qualms with the PureOne 14612 since it has a 14-18 psi bypass rating.
By the way, this is bad news, but the black Tokyo Roki Subaru filters do NOT have the 23.2psi bypass pressure. My Rex came with one on it from the factory and I chopped it up and tested. After 5 trials, it came in in the high 18psi range....so it is no exaggeration that the 'previous filter did not meet Subaru specifications'. To dummy check I reduced the sectional area of the valve by .5mm in diameter (even though my calipers are very accurate to the .1mm (read to .01mm). Even with that, the bypass pressure at highest would be 19.5ish. The blue OEM by Honeywell read 22.7-23.9psi for me using 3 filters and two trials each. My digital scale is accurate to the gram. So if you are satisfied with the black Toyko Roki, then you should have no qualms with the PureOne 14612 since it has a 14-18 psi bypass rating.