Originally Posted by cryo
The Factory by pass valve is very capable of stage 1 and stage 2 levels and rarely presents any mechanical failures. After 18psi some have showed signs of leaking where as others have held 22-23psi daily for years with no signs of failure. Most wait untill they fail to replace them and is good practice in my opinion. There are a few aftermarket units that perform like stock and are of much better design so those can be great replacements if your stock unit does fail. Normally “tuning” the bpv/bov consists of adjustment of different springs for pressure.
Which aftermarket BOV's do you have positive experience, My current tune has me on about 20-21psi im not sure how well stock one currently performs.
I'll be in touch about etune after i get my fueling mods in and see what you can do with it maybe!