As an automotive enthusiast, I am always on the lookout for upgrades that enhance my car's performance.The AEM S R S upgrade for my Mazda Protege L4 99-03 did not disappoint! As my tests showed the increased airflow and engine efficiency resulted in a noticeable increase in horsepower and torque. The installation process was easy, AND the quality craftsmanship of the product was evident. The only downside I experienced was the slight increase in engine noise, but the improved performance more…