19:12 2 Mercedes cars line astern. If you pause at the point mentioned, you can see visual differences between the V12 powered CLK-GTR and the V8 powered CLK-LM
A lot of it boiled down to the restrictors the JGTC GT500 cars had to run. In GT1 trim, they could easily compete in the 550-600 hp range, but as they were required to run to JGTC GT500 rules, the engines were detuned to run only 470-480 hp.