So if it were you (or me), a 5-11, 162-ish driver racing Yamaha spec pipe / can, would you take out the middle bearing or leave it in?
When I got the kart, I took it out, but my racing friends tell me to put it back in. Their argument is that having it in gives me more tuning options. My counter to that is if I want to tighten up the rear, I can
1. narrow the rear track
2. tighten the bolts to my rear bumper
3. install my rear torsion bar