N1-X Evolution Extreme Catback Exhaust - 2022+ Honda Civic Si [FE1] / 2023+ Acura Integra [DE4] ** PRE-ORDER : Sold Out**

APEXi SKU: 164KH003


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The N1 Evolution Extreme is based on the proven performance basics of the N1 muffler which emphasizes optimum,  exhaust efficiency utilizing a straight-thru layout design. Equipped with an internal hybrid silencer uniting power and free flowing characteristics with effective functional sound resonance. A newly adopted muffler tip completes the tail end of the exhaust that serves both purposes of function and form. Constructed with a light weight titanium material rolled and riveted onto a double pipe structure which acts as a diffuser enabling temperature reduction, meanwhile retaining a sporty heat gradation appearance.


  • N1-X titanium tips specially designed with clearance to reduce heat transfer
  • Top Level quality using full tig-welded SUS304 stainless steel 
  • Matched and manufactured for select chassis
  • A'PEXi intricate designed brackets
  • Resonated midpipe structure
  • Comfort with optimal performance gains

* Does Not Fit : Honda Civic Hatchback Models (2022+)

Bolt-On Yes
Part Number 164KH003
Year 2022+, 2023+
Make Honda, Acura
  • Civic Si Sedan FE1
  • Integra Sedan DE4
Body Style
  • FE1 - 4 Door Sedan
  • DE4 - 4 Door Sedan
Engine L15BA (Turbo)
  • FE - 4 Door Sedan
  • DE4 - 4 Door Sedan
Exhaust Type N1 Evolution Extreme Muffler (N1-X)
Piping Diameter 3inch to 2.5inch
Tip Diameter 105mm. x 2
Pieces 3
Exhaust Tip Style Titanium Round- Dual wall rolled, Angle cut (Riveted)
Piping Material SUS304 Stainless Steel
Muffler Material SUS304 Stainless Steel
Muffler Tip Material Titanium
WARNING: California Prop 65
Cancer & Reproductive Harm