Cat Back Exhaust for Honda Civic (2017-2021) 1.5L

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

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.