In ERC, Lappi competed in three tarmac rallies, winning the last of them Rallye International du Valais in Switzerland.

Lappi won the 2014 European Rally Championship title with victories in Latvia, Northern Ireland and Switzerland.

He scored two wins in Poland and Finland on his way to finish the season in third place behind Nasser Al-Attiyah and Yuriy Protasov.

He won the 2016 World Rally Championship-2 with the Škoda Fabia R5 after winning in Finland, Germany, Wales and Australia.

[9] After Citroën's exit in 2019, Lappi signed for M-Sport to drive the whole season in a Ford Fiesta WRC alongside his compatriot Teemu Suninen.

The 2023 season was also Lappi's first full-time contract since 2020, with the change to Hyundai being based on the Finn's desire for more regular driving in the championship.

[14] Lappi would go on to place in sixth in his maiden Hyundai season, ahead of Takamoto Katsuta and behind Sébastien Ogier.

[15] Lappi would re-sign with Hyundai again for the 2024 season, although this time on a part-time status and only competing on selected events.