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Instruction Sheets for Part Number BOR-11971
Borla S-Type Axle-Back Exhaust Systems
Exhaust Systems, Subaru Crosstrek, 2.5L, AWD, Auto, S-Type, Axle Back, Kit
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Estimated Ship Date: Oct 26, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
11971
Part Type:
Product Line:
Summit Racing Part Number:
BOR-11971
UPC:
808422119719
System Material:
304 stainless steel
System Style:
Rear axle-back
Exhaust Type:
Single
Exit Location:
Rear
System Finish:
Natural
Catalytic Converter(s) Included:
No
Intermediate Pipe Diameter (in.):
2.00 in.
Muffler Included:
Yes
Muffler Quantity:
One
Muffler Configuration:
Single inlet/Single outlet
Muffler Style:
Turbo
Muffler Material:
304 stainless steel
Muffler Color:
Natural
Hardware Included:
Yes
Tailpipe Diameter (in.):
2.00 in.
Tip Included:
Yes
Tip Outlet Size (in.):
3.50 x 2.75
Tip Quantity:
1
Tip Shape:
Oval
Tip Cut:
Slant
Tip Edge Style:
Rolled edge
Tip Material:
304 stainless steel
Tip Color:
Polished
Remanufactured:
No
Quantity:
Sold as a kit.
Special Attention:
It is illegal to install parts or components that bypass, defeat, or render inoperative the manufacturers’ technology and design necessary to reduce vehicle emissions to meet state and federal Clean Air Act standards.
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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Some parts are not legal for use in California or other states with similar laws / regulations
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