I started noticing a bit of non-linear power from my 2009 MINI.... Sort of a mild "rocking chair" effect when applying boost..... I knew the OEM diverter valve had a weak design with a flexible baffle, subject to rips / tears / pin holes.... For some background story, K-huevo discusses the problem under "Today's Job" [URL]https://www.motoringalliance.com/threads/todays-job.5621/page-3[/URL] I was surprised to see there was a new revision to the design, where the rubber baffle (yellow) has been...