Cat Back Exhaust for Honda Civic (2017-2021) 1.5L
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High-Flow Cat Back Exhaust for 2017-2021 Honda Civic (FC/FK)
What it Does: The Cat Back Exhaust replaces restrictive factory post-catalytic piping on the 2017-2021 Honda Civic 1.5L to lower backpressure, accelerate exhaust gas velocity, and deepen the exhaust tone.
The Stock Honda Civic Exhaust Restriction
Factory exhaust plumbing on the 10th-generation FC/FK Civic relies on narrow-diameter tubing, press-bent pinch points, and heavy, multi-chambered mufflers. On forced-induction platforms powered by the L15B7 turbocharged engine, these bottlenecks create excessive exhaust gas backpressure behind the turbine housing. This residual heat buildup impairs spool characteristics, dampens acoustic feedback to a muted hum, and limits high-RPM scavenging efficiency.
The Engineering Solution
Fabricated from corrosion-resistant 304 stainless steel, this cat-back system replaces restrictive OEM runs with continuous mandrel-bent tubing and a straight-through canister architecture. By removing sharp directional internal baffles, the system significantly reduces post-catalyst flow turbulence and thermal retention, allowing the 1.5-liter turbo to breathe freely under boost. Precision-welded joints and durable hanger brackets guarantee structural integrity under aggressive vibrational loads, matching factory mounting points for a direct-fit installation.
What's Included
- Cat-back exhaust piping
- Integrated exhaust tip section
- Mounting hardware as pictured
Technical Specifications
| Fitment | 2017-2021 Honda Civic |
|---|---|
| Engine / Chassis | L15B7 1.5L Turbo / FC1/FC3/FK7 |
| Stock Output | 174-205 hp / 162-192 lb-ft |
| Replaces OEM Part # | B-EXT-MP008-2 |
Compatibility
- 2017 Honda Civic 1.5L Turbo
- 2018 Honda Civic 1.5L Turbo
- 2019 Honda Civic 1.5L Turbo
- 2020 Honda Civic 1.5L Turbo
- 2021 Honda Civic 1.5L Turbo
Frequently Asked Questions & Fitment Warnings
Does this fit the FC/FK Civic?
Yes, this is a direct fit for the 2017-2021 Honda Civic equipped with the L15B7 1.5L engine. This system does not fit naturally aspirated 2.0L (K20C2) or Civic Type R 2.0L Turbo (K20C1) models.
Are gaskets and installation fasteners provided?
Mounting hardware is included as shown; always torque fasteners to factory specs and check for leaks post-install.
The Honda Tuning Caliber
Engineered to complement modern JDM turbo architecture, this 304 stainless cat-back delivers a sharp, clean acoustic profile while freeing up critical exhaust flow under sustained boost.
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