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One way to increase power in a car engine is to remove the catalyst, but this cannot be done in every engine or car. This depends on the design of the engine, whether it originally had a catalyst or not. However, in engines like the L90, where the catalyst cannot be removed, a piece of equipment called a downpipe must be used, which has a function similar to a catalyst and is designed for this model of car. #catalyst #L90 #downpipe