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The Subimods website describes general exhaust products for Subaru, mentioning that catback and axle-back exhaust systems replace different sections of the exhaust to improve flow and sound. A catback system replaces everything from the catalytic converter back, offering significant gains in exhaust flow and a deeper, more aggressive tone. An axle-back replaces only the rear section from the axle to the exhaust tips, providing a more subtle sound upgrade with easier installation. Installing performance exhaust components will give your Subaru a more aggressive exhaust note and can improve throttle response and engine efficiency.