This Borla system has a valve simulator to prevent the Check Engine Light from coming on. The 3.5" into dual 2.75" system features the classic S-Type sound level with no drone inside the vehicle. Replace the small muffler behind the primary muffler in this Borla S-Type system with Polyphonic Harmonizer 60680 to attain the ATAK sound level (louder than S-Type). Optional True Dual Cat-Back system available. This system features 3.5" black chrome on T-304 stainless steel tips. Installation REQUIRES removal of the Factory Valance Tips. Using Borla Stainless Steel Polish p# 21499 is NOT recommended with these black chrome tips.

We suggest cleaning the tips with hot water and a microfiber cloth. Borla Cat-Back and Axle-Back exhaust systems feature patented straight-through and multi-core technology designed to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive Borla Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium T-304 stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Give your Silverado or Sierra the power and sound it deserves, bolt on a Borla. Best of all, Borla stands behind every system with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.

Features

• Borla system has a Valve Simulator
• Polyphonic Harmonizer 60680 can be added to this system to attain the ATAK sound level
• Installation REQUIRES removal of the Factory Valance Tips

Fitment notes

• Does not fit ZR2 & AT4X models.
• Factory Split Rear Exit Vehicles ONLY.
• Add Adapter 60706 for Crew Cab with Standard Bed (6' 7") 157" Wheelbase vehicles.
• Does not fit ZR2 & AT4X models. Fits Factory Split Rear Exit Vehicles ONLY.