Borla 11991 S-Type Axle-Back Exhaust System for 2025 Kia K4 2.0L

The BORLA® R&D Team has developed an awesome sounding exhaust for your Kia K4. Our 2.25" diameter Axle-Back™ system is specifically tuned for the 2.0L engine. The S-Type system delivers a sound that is much sportier than stock, yet still refined and far from obnoxious. Not to mention, a drone-free driving experience for comfort during cruising speeds. The exhaust exits thru a 2.25" brushed T-304 stainless steel turn down spout with a laser cut BORLA® logo. BORLA® Cat-Back™ & Axle-Back exhaust systems feature patented straight-through and multi-core technology 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, high-quality T-304 austenitic 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 a flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Bolt-on a BORLA® and get the sound to match your Kia's Performance. Each BORLA® Exhaust System is built from premium T-304 austenitic stainless steel to give you the absolute best in performance and durability. 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. S-Type Axle-Back Exhaust System 2025 Kia K4 EX/ LX/ LXS 2.0L 4 Cyl. Automatic Transmission Front Wheel Drive 4 Door Sedan. 2025 Kia K4 EX/ LX/ LXS 2.0L 4 Cyl. Automatic Transmission Front Wheel Drive 4 Door Sedan.

• Turn down tip muffler assembly features a laser cut BORLA® logo

Upgrade your 2025 Kia K4 with the Borla 11991 S-Type Axle-Back Exhaust System, engineered specifically for 2.0L four-cylinder models with automatic transmission, front-wheel drive, and a four-door sedan body. This system produces a sportier exhaust note than the factory setup while maintaining a refined, drone-free driving experience during highway cruising.

The 2.25-inch exhaust system uses premium T-304 austenitic stainless steel for long-term corrosion resistance, performance, and durability. Its straight-through and multi-core technology is designed to improve exhaust flow and velocity, helping support responsive performance and the distinctive Borla Sound of Power. Smooth mandrel bends and precision CNC manufacturing promote consistent airflow and an accurate fit.

The exhaust exits through a 2.25-inch brushed T-304 stainless steel turndown tip featuring a laser-cut Borla logo. The bolt-on design is tailored to the Kia K4 application for a straightforward installation using the vehicle’s existing exhaust layout. Like other Borla exhaust systems, part number 11991 is backed by Borla’s Million-Mile Warranty for added ownership confidence.

Brief Description

A refined, performance-oriented S-Type axle-back exhaust system for the 2025 Kia K4 2.0L sedan.

Key Product Specifications & Technical Data

• Brand: Borla
• Part Number: 11991
• System Type: S-Type Axle-Back Exhaust
• Application: 2025 Kia K4
• Engine: 2.0L four-cylinder
• Transmission: Automatic
• Drive Configuration: Front-wheel drive
• Material: T-304 austenitic stainless steel

What's Included

• Axle-back exhaust system
• Brushed stainless steel turndown tip
• Laser-cut Borla logo tip detail
• Installation components required for the application

Fitment: Fits 2025 Kia K4 EX, LX, and LXS models equipped with the 2.0L engine, automatic transmission, front-wheel drive, and four-door sedan body. Verify vehicle configuration before ordering.

Features:

• Sportier, refined sound: Borla S-Type tuning delivers a more aggressive exhaust note than stock without an excessively loud character.
• Drone-free cruising: Tuned for comfortable highway driving and reduced unwanted interior resonance.
• High-flow construction: Patented straight-through and multi-core technology promotes increased exhaust velocity and efficient flow.
• Premium stainless steel durability: T-304 austenitic stainless steel construction resists corrosion and supports long-term performance.

Fitments:
2025 Kia K4 EX
2025 Kia K4 LX
2025 Kia K4 LXS

Air Freight Prohibited: false
Not Carb Approved: false
Carb Acknowledgement Required: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Regular Stock: t
Units Per Sku: 1