In 2007, he switched to a Renault Clio S1600, finishing third in the category on Rally Finland.

[2] He returned to Suzuki for the final round of the season in a Swift S1600 and continued using the model in 2008.

He finished third in the JWRC category and tenth overall on the 2008 Rally Mexico, before winning the next round in Sardinia.

He continued with Suzuki in 2009, winning in Portugal and Argentina and finishing runner-up overall.

In 2010, Kościuszko made the move to the SWRC, starting the season in a Ford Fiesta S2000.