The red E92 335i has the FFTec single scroll bottom mount N54 single turbo manifold with a single scroll Precision 5858 turbocharger. It is also a 6-speed automatic.
Now, the E82 135i is the lighter car of the two that much is known. The 5862 is the twin scroll variant which means it gathers exhaust gases from pairs of cylinders in an alternating sequence. A diagram illustrating this effect is below:
Terry of BMS states he prefers the spool of the 5862 to the larger 6466 and that this turbo is the perfect size for the motor especially when you get the twin exhaust pulses from a twin scroll setup. The 5862 top mount sure seems to show here it has a much bigger top end punch than the 5858 but seeing a comparison to the 6466 certainly would be interesting.
The power to weight of the 135i clearly favors it significantly and this race is not even close. The 135i simply pulls away.
It definitely is nice to see a real world comparison of different single turbocharger approaches on the N54 motor, video below.