The Flowmaster FlowFX DOSS Cat-Back Exhaust System is a high-performance exhaust upgrade designed for 1999-2006 GM 1500 trucks, including the 2007 1500 Classic models. Constructed entirely from durable 409 stainless steel, it features 3.00-inch to dual 2.50-inch mandrel-bent pipes that optimize exhaust gas flow for improved performance. Equipped with a FlowFX "straight-through" muffler, this system delivers a moderate to mild sound level while maximizing horsepower and torque gains, with dyno results showing an increase of +14 hp and +13 lb-ft at the rear wheels. The dual 4.00-inch black ceramic tips add a stylish, custom appearance. The system utilizes factory hanger locations and includes all hardware and instructions for straightforward installation, backed by Flowmaster's Lifetime Limited Warranty.
This exhaust system is designed specifically for 1999-2006 GM 1500 trucks with 4.3, 4.8, or 5.3-liter engines, including Crew Cab with a 5.5-foot bed and Extra Cab with a 6.5-foot bed. It is a direct bolt-on replacement that enhances performance and sound for street and daily driving applications. The system exits on the passenger side, in front of the rear wheel, providing a balanced and aggressive look. Suitable for enthusiasts seeking increased power, improved exhaust flow, and a custom aesthetic, this system is ideal for upgrading stock exhaust setups on compatible GM trucks.
