Picture comparing the oem rear shifter bushing to my kartboy rear shifter bushing. The Kartboy bushing is obviously a higher quality, much more robust and rigid. With this my entire driveline will be locked down and flexible rubber removed and replaced with either spherical bearings or polyurethane. A lot of people shrug these little parts off as they can add up in price (especially high quality spherical bearings) but in my experience they are essential to a functional end product. On my 240sx I replaced all bushings to spherical before upgrading to a mid level set of coilovers and was astonished at the capabilities of that car. These bushings are what allows you to gain tenths both on the track and skidpad, and give you the confidence to push the car to the limits of adhesion. The amount of confidence non-compliant bushings give in driver confidence is astounding, once you take the plunge you will be astonished how vague cars without spherical bearings feel.
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