Borla S-Type Axle-Back Exhaust Systems for 2025 K4, 2025-2026 K5 - 11991

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Part Number: BOR-11991

$399.99

Exhaust System, Axle-Back, Single, 2.25 in. "S-TYPE", Turndown Tip, Kit
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Borla S-Type Axle-Back Exhaust Systems for 2025 K4, 2025-2026 K5 - 11991

Borla S-Type Axle-Back Exhaust Systems for 2025 K4, 2025-2026 K5 - 11991

BOR-11991

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Part Number: BOR-11991

Estimated Ship Date: Nov 10, 2026

$399.99

Estimated Ship Date: Nov 10, 2026 Would you rather pick it up?

Overview

Brand:
Manufacturer's Part Number:
11991
Part Type:
Product Line:
Summit Racing Part Number:
BOR-11991
Item Number:
8611532
UPC:
808422119917
System Material:
304 stainless steel
System Style:
Rear section
Exhaust Type:
Single
Exit Location:
Rear
System Finish:
Natural
Catalytic Converter(s) Included:
No
Muffler Included:
Yes
Muffler Quantity:
One
Muffler Configuration:
Single inlet/Single outlet
Muffler Style:
Turbo
Muffler Material:
304 stainless steel
Muffler Color:
Natural
Muffler Finish:
Brushed
Hardware Included:
Yes
Tailpipe Diameter (in.):
2.25 in.
Tip Included:
Yes
Tip Outlet Size (in.):
2.25
Tip Quantity:
1
Tip Shape:
Round
Tip Cut:
Slant
Tip Edge Style:
Non-rolled edge, single-wall
Tip Material:
304 stainless steel
Tip Color:
Brushed
Remanufactured:
No
Quantity:
Sold as a kit.

Borla S-Type Axle-Back Exhaust Systems

Borla S-Type axle-back exhaust systems replace the factory rear muffler(s) and exhaust pipe(s) and are installed behind a vehicle's rear axle. Following the same exhaust path and secured using the original hangers and rubber isolators, Borla axle-back (or rear section) performance exhausts are less restrictive than factory exhaust systems and improve the sound level both inside and outside the cabin.

S-Type axle-back exhaust systems use engine-specific (not universal) mufflers that are designed, tested, and optimized specifically for a particular year, make, and model. Improvements in sound and performance are accomplished by using superior muffler designs, mandrel-bent tubing, and the application of proper engine-matched tubing diameters. Welded tips are standard on most systems.

Many vehicles have a factory service-point in the exhaust system (flange or slip-fit) located in the exhaust tubing behind the rear axle; so most Borla S-Type axle-back installations are completed in less than an hour with no cutting of the factory system. Vehicles that don't have a factory service-point require cutting, so Borla includes easy-to-follow instructions and hardware to complete the installation.

Borla pioneered the use of aircraft-grade 304 stainless steel tubing, a material with a higher content of carbon and nickel that won't rust or corrode, for the automotive exhaust aftermarket … including Borla S-Type axle-back exhaust systems.

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