HKS Hi-Power Race Cat-Back Exhaust - Honda Civic SI EP3

Regular price $750.00 USD $592.00 USD

Ready To Ship! Special Order! Ships in 10+ weeks

Part # hks32003-BH001

Constructed out of fully polished SUS304 Stainless Steel, the HKS Hi-Power exhaust system was designed for enthusiasts seeking a high quality performance exhaust system with increase in the exhausts tone depth. The RSX cat-back includes the rear muffler and mid/center pipe that bolts up to the OEM down-pipe.

Inspired and designed from endurance and GT racing in Japan, HKS developed its Hi-Power Exhaust system for both forced induction and naturally aspirated applications. HKS has incorporated this new race inspired offset muffler and piping design into many street applications, which offers a greater flow and higher-PRM power gains due to the less restrictive design.

Intended for race and off-road applications, namely high power naturally aspirated or forced induction applications.

**New Reduced Price!!!**

  • Honda Civic SI [EP3] (2002, 2003, 2004, 2005)


  • SUS304 Stainless Steel Cat-Back Exhaust System
  • Polished muffler for aesthetics
  • Black Coated Piping for durability
  • 60mm piping with a 115mm tip
  • May require modification of aftermarket rear bumpers/spoilers
  • Includes mid/center pipe
  • Includes Silencer

Extended Information

  • Type: Single Cat Back Exhaust with Center Pipe
  • Piping Diameter: 60 mm
  • Tip Diameter: 115 mm
  • Material: SUS304 Stainless Steel Piping
  • Idle tone: n/a
  • Chassis: DC5
  • Engine: K20A3
  • Ground Clarence (from lowest point at oem height): n/a
  • Weight Total: n/a
  • Notes: N/A
  • Warranty: HKS Manufactures Warranty
  • Box Weight & Dimensions: n/a

Customer Reviews

Customer Reviews

Based on 9 reviews
Ezra M. (Ooltewah, TN, US)

Fits great, sounds amazing!

Richard C. (Calgary, AB, CA)
It’s worth!

It sounds amazing. No rasp or drone and it sounds really deep. Arrived within 5 business days and had no issues.
I made a video of how it sounds on Instagram

Augustine V. (Bakersfield, CA, US)
Great job

I received the hks exhaust it was fast shipping and in great condition thank you very much.

RJ G. (Las Vegas, NV, US)
Amazing exhaust

Perfect fitment, deep smooth sound with no rasp or drone. Best exhaust for the EP3!

Iriana O. (Arlington, TX, US)
Sounds good and deep

So I have an ep3 lol and it was so quiet so I decided to get this cat back, I’m so happy I did! Sounds good very deep and not like a fart can 😵‍💫didn’t put the silencer on but could be a little louder? But I’m working on getting my air intake soon so that might help!(i hope so) I have some video of it on my Instagram highlights if you’re interested!!@iriana._ 💗 Thank you for reading

Adier N. (Orlando, FL, US)
Perfect sound

This hks hi power exhaust is just what I was looking for, love the sound.

Louis B.J. (Cincinnati, OH, US)
Fits like a glove

so im 38, heard about HKS in fast and furious 1, and now i can afford it, and they do not disappoint. Install was perfect and matched great to factory cat and exhaust hangers. KAMISPEED was fast and prompt with shipping despite the COVID stuff.

Customer Questions


In stock, non special order items can be returned within 30 days of the product arriving to your house or place of work.
Returns will NOT be accepted on Clearance Items, Final Sales, Special Orders, Opened, Installed, Incomplete, or Otherwise Used Products. In order to initiate a return, an RMA number must be requested and approved via e-mail.
All returns will be subject to a 20% restocking fee minus complete shipping cost (roundtrip).

Any processed orders that have not shipped will incur a 6% cancelation refund fee unless the product was not available to ship within a timely manner. No fee will be incurred if used as store credit.

For complete details on our return policy, please see our Help and FAQ link under HELPFUL INFO.

All international orders outside of the USA are subject to duties and taxes per your countries jurisdiction and determined by customs.
Kami Speed serves the right to ship using an alternative method if we see it fit, in order to expedite shipping and reduce your rate depending on product value.