Well I replaced mine with a GFB Hybrid bov to fix my factory leaking bov, after a retune it definitely made a huge difference and fixed that issue
No leaks from mine however not running huge boost only 18 psi
Mint, damn you joker, i want one.
Sadly it's quite a different install for the B4, they have the bolt-on-the-intercooler ones remember. But the idea is still the same, "take off old one, put on new one"