I was going to approach an engineer until October 2014 when my R33 was written off in a flood. I had adjustable arms with spherical bearings on it and was a little concerned about defects. I'll admit that if I were to do it again, I'd probably choose bushes over bearings... In hindsight the increase in NVH, the cost of replacement bearings and the stress of law enforcement attention (if engineered or not) just wasn't worth the "increased performance" (not that I could tell, I was replacing 15 year old OEM bushes with bearings, of course there was going to be a performance increase). Unless it were a dedicated track car, which I don't see my finances being good enough to handle at the moment [emoji23]