McLaren is unveiling a new front wing and floor for this weekend's Spanish Grand Prix in its bid to stay on the heels of Mercedes and Red Bull in the F1 championship.
The Woking-based team has enjoyed a solid start to the season, collecting 53 points from the opening three races, with Lando Norris especially in stunning form.
With the race at Barcelona's Circuit de Catalunya now traditional for teams to reveal new parts, Seidl said: "We've some upgrades or modifications this morning. You can see a modified front wing and floor."
Jokingly, Seidl then added: "That was for you guys [the media] because some people complain I never speak about which parts we upgrade."
Far from resting on its laurels in a year when development is split between the current car and next year's model under dramatic new regulations, Seidl remarked: "We will try to bring more upgrades in order to get more performance out of it.
"It's great to see this momentum we have there on the development side and production to bring even more and more parts to the track."
Seidl has confirmed McLaren continues to undertake "parallel development", although technical director James Key has "a clear plan when he wants to fully switch to next year's car".
Seidl added: "I would say it's a bit dynamic with the potential we still see with the development directions of this year's car.
"If we see that there are any low-hanging fruits then we might decide we want to invest some energy in this year's car for a bit longer.
"But at the same time we agree that given our ambition we will not lose sight on our overall journey which is where we clearly want to make steps in the next years.
"The new regulations are clearly an opportunity for us to hopefully get closer to the front in Formula 1. That's obviously priority number one for us."
What do you think?
2023 is absolutely the priority, I agree. Even more is up for grabs next year than the latter part of this.
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