Catless Downpipe - Honda Civic FK8 17-21

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Sale price$1,196.10 Regular price$1,329.00

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The K20C engine was designed for use in a normal road car and features a catalytic converter, removing this converter eliminates its restricting effects which significantly increases the engine horsepower. HKS developed an extension pipe without the catalytic converter and a frontpipe that will connect it to a catback exhaust system.

NOTE: Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition. 


  • Removing catalytic converter results in a more linear boost and throttle response.
  • Uses 3 inch pipes, compatible with HKS catback exhausts.
  • A perfect addition to intake, intercooler and other HKS products for future ECU tuning and boostup.
  • Decreases secondary exhaust gas pressure from turbine and reduces exhaust restriction.


Max Power Max Torque
HKS (100 Octane) 383HP / 6500rpm HKS (100 Octane) 376Ft-Lbs / 6500rpm
HKS (91 Octane) 349HP / 630rpm HKS (91 Octane) 360Ft-Lbs / 6300rpm
Stcok (91 Octane) 300HP / 6000rpm Stcok (91 Octane) 295Ft-Lbs / 4400rpm

HKS Engine Spec:

Intake HKS Carbon air intake system Blow-off HKS SSQV Kit
Piping HKS Piping Kit Intercooler HKS Intercooler Kit
Oil cooler HKS Oil cooler Kit Downpipe HKS Racing Extension
Exhaust HKS LEGAMAX Premium ECU Honda Flash Pro
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