My three most important modifications as a prerequisite for good drivability:
1) Vredestein T-Trac 2 Tyres
2) 140 pounds of Mulberry springs in the front and 4 seater springs in the back.
3) after four! sets of brake discs, all of which started shaking and wobbling after 6000 km each:
New original brake disks, but skimmed carefully flat before first use and working wonderfully smooth for 60,000 km.
These were the three most important (or most necessary) of several measures. The first two, so that the car drives properly at all. Even manifold and ECU tuning and other valuable measures come later in the ranking.
