Karimi and Longden took full advantage, each earning a strong finish to end their seasons.
With the title already decided in the BIC 2,000cc Challenge, champion Shaikh Hamad bin Isa Al Khalifa did not participate in the season’s last round, leaving an opportunity for others to rise onto the podium.
Karimi won the 15-lap first race in 22mins 38.934secs in his Honda CRX. Tim Birkin in a Honda Integra finished as the runner-up 6.626secs behind, and Longden in his BMW 3 Series third 6.867secs back.
Abdulaziz Ashkanani in a Honda S2,000 was fourth and Mohammed Faqihi in a Honda CIVIC was not classified.
In race two, the battle had dwindled down to just two drivers. Longden was quicker than Birkin by just 1.507secs.