Lotus will continue to run the Coanda-effect exhaust on Kimi Raikkonen's E20 for the remainder of the Korean GP weekend.
The Finn tested the new exhaust, along with several other parts, in Friday's practices at the Korean International Circuit.
And although Raikkonen stated that the car "didn't feel good today and we were one second off the pace", overnight analysis has led to Lotus saying they will continue with the exhaust.
"We are at the beginning of a relatively long road with them," technical director James Allison told Autosport.
"It's not straightforward to make them work from the start, but the numbers we got are good so we are quite pleased."