🔊 Flowmaster 842580 2.5" In/Out 80 Series 409s Muffler, Black - Enhanced Exhaust Performance! Review

This muffler has been the biggest disappointment for my automotive upgrades. Based on my observations, it did not provide the performance boost I was expecting. The pros were that it was easy to install. However, the cons outweighed the pros as it did not deliver the desired increase in horsepower or torque. I would not recommend this product for those seeking performance gains in their exhaust systems.

These things work great on my Street Rod I didn't have room in the back for the exhaust pipes. A piece of cake on the side with an inlet at one end. Well done.

These things work great on my street rod. I had NO room for exhaust pipes in the back. A piece of cake on the side with an inlet at one end. Well done.