Yep, there is an upshift delay valve which delays the shift from 2nd to 3rd, keeping the car at a higher rpm. Lets the catalytic converter to warm up faster to reduce smog emissions.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".