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No two engine models are created equal - hence all the debate... The cold air intake & K&N in the airbox worked wonders on my RAV4 4 x 4 2,0 liter VVTI engine - gave about 1-2 km/l more.
On the Yaris - the judges are still out.
On your diesel - no question that I woild go for a K&N and cooler air intake. Try, and see what happens - and report back to us.
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