HKS Legamax Premium Cat-Back Exhaust | 2017+ Honda Civic Type-R (31021-BH003)



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17+ Civic Type-R Legamax Premium Cat-Back Exhaust by HKS

The HKS Legamax Premium Cat-back Exhaust for the new 2017+ Civic Type R is the very first in their complete product lineup!

This exhaust increases piping diameter in each stage, making it a 3-inch main pipe to dual 2.4-inch pipes into the mufflers and finally out of dual 3.8-inch Burnt Titanium Tips. Overall the exhaust reduces back-pressure by 50%, this allows the turbine to spin more freely from a low RPM and improves overall power and response across the power-band.

This exhaust system has been engineered and designed to handle up to 540 ps (532 HP) without any power loss, so it's great for high power builds. It also features a dual muffler and small resonator that is guaranteed to provide zero drone for deep throaty note while still having a comfortable ride.


  • 3-inch to dual 2.4-inch catback system
  • Dual 3.8-inch Titanium burnt tips
  • Reduces back-pressure by 50% for increase in overall power
  • Calculated to handle 500+ HP builds without power loss
  • Same weight as OEM system while increasing exhaust flow
  • Designed to be sporty but comfortable enough to daily
  • Made in Japan


  • 2017+ Honda Civic Type-R (FK8)


  • Piping Diameter: 75 to dual 60 [mm]
  • Tip Diameter: Dual 97 [mm]
  • Material: SUS304
  • Idle Sound: 67 [db] (versus 58 db OEM)
  • Sound: 88 [db] (versus 82 db OEM)
  • Weight: 17.5 [kg] (same as OEM)

What's In The Box?

  • 1 - HKS Legamax Premium Cat-Back


  • Manufacturer Standard Warranty

Customer Reviews

Based on 11 reviews
A bit louder than stock, sounds great

Easy install and great fitment. Right after install, it was a little bit drone-y around 2500-3000 rpm on the highway, but after 1000 miles it has either broken in or I've gotten used to it. Not terribly loud but the sound itself is deep and throat-y, as much as an FK8 can sound that way.

Joaquin Miguel Ranjo
Perfect Exhaust for FK8

Fast shipping and legit customer service. Easy to install, took us about an hour to finish.
Good quality and Sounds great! I have a new 7 month old baby and he can still easily fall asleep as it's not too loud.
Thanks MAPerformace!

Dane Panos
Perfect with the right down pipe

This exhaust paired with my RV6 catless downpipe has really woken up the car. It's loud when you want it and calms when cruising. MAP as always with great shipping as well.

Kenneth Creitz
Very happy

Best exhaust ever!!!

Not what i expected....

First must say Maperformance did an outstanding job to get this to me so quickly. Everything went smoothly and will definitely buy from here again. As far as the exhaust goes.. Well I've been around doing this since the 90s and now a days i don't like super loud exhaust and heard this was good fit. Cant compare to others but drove off after install and couldn't even tell it was installed. It's too quiet with a mellow sound on low RPMs. Will look into changing it in the future, nothing compare to my old 9th gen civic Q300. If you looking for HKS Legamax just keep in mind its not much louder then stock. Overall very disappointed.