The Italian carmaker is growing weary of its drivers’ increasingly garish customization requests, and its CEO is keen to take steps to narrow the scope of its own color offering as a result.

Ferrari’s CEO Benedetto Vigna warned of the prospect of a growing number of “strange” Ferraris being unleashed on the roads, devaluing the brand.

“We have been thinking internally maybe to pre-define the [color] combinations. We have to pay attention because we have to defend the values and the identity of the brand. We will not make a strange car, for sure,” Vigna said on an analyst call.

Ferrari grossed around €1.3 billion ($1.35 billion) from personalization last year, accounting for about a fifth of overall revenues. The carmaker would rather personalizations were made on its terms, though, and it has struggled to talk down some customers.

“There are some places in the world where they like to have a set menu. There are other places where they want à la carte and to be free to select what they want,” said Vigna.

On Ferrari’s earnings call on Tuesday, Vigna said carbon finishes were also an increasingly appealing personalization. In addition to protecting the brand, Vigna said that he wanted to preserve the value of second-hand Ferraris, which are often traded in by owners for new models. 

“There are some combinations that are not liked or loved by the second potential buyer,” said Vigna.

Contrary to earlier reports, a representative for Ferrari denied that the carmaker was contemplating blacklisting customers who went too far personalizing their cars.

Carmakers double down on personalization

More than 90% of Ferraris ever made are still on the road, according to Ferrari pre-owned director Andrea Scioletti, so any customizations not in line with the carmaker’s vision could leave long-lasting scars.

The Ferrari Approved program involves a detailed inspection and renovation of pre-owned Ferraris before they are sold to a new buyer, including exterior and interior pre-preparations. 

Ferrari’s reticence to give customers carte blanche to modify their cars as they wish throws up a quandary for a luxury sector that has been on an investment drive to improve its personalization capabilities.  

Bentley enjoyed revenues of nearly €3 billion ($3.1 billion), crediting “levels of personalization that we’ve never seen before” as customers spent hundreds of thousands of dollars each modifying their cars.

Luxury carmakers have pledged to double down on their ability to serve their superrich buyers’ quirky, expensive preferences, bringing more of this lavish spending in-house and away from third parties.

Jaguar Land Rover announced in January a £65 million ($81 million) investment at two of its sites to expand its paint capacity, which would allow drivers to paint their car the same color as their private jet or yacht.

In the same month, Rolls-Royce announced a £300 million ($376 million) investment in its U.K. Goodwood factory focused on bespoke models, allowing its global customers to “craft an entirely original motor car.”

Editor’s note, February 10, 2025: After publication, a Ferrari representative confirmed to Fortune that Ferrari is not planning to blacklist customers who overly personalized their cars after purchase, contrary to previous reports.