2003 Boxster doesn't corner as good as 2011 Golf TDI?

[jb92563]

Could also be the alignment. Perhaps more toe-in and camber is required.

Check tire pressures as well, around 30 psi is good and most importantly make sure both sides are equal.

Many folks including myself regularly Auto-X and with high speed, tight cornering like that, the car feels very solid and sure footed, nothing vague or floaty about it.

Definitely something wrong that you need to sort out.

I always start with the least expensive things and work toward the most expensive for resolution of unknown issues.