Sonoma session 5 in SS 1LE

Last session of the day. Was letting Eggplant by on the out lap at T7 and the Ariel Atom snuck pass me and proceed to hold me back for 2 laps. Not sure why since in prior sessions I passed him and he was never able to catch me. It's able to put down power out of corner which make passing him safely without dive bomb difficult even though I am easily 2 to 3 seconds faster per lap.