A'PEXi - N1 Evo Extreme (Catback) - 2015-2021 Subaru WRX / STi (VA)


The N1-X 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.

- High-level of quality using tig-welded SUS304 stainless steel uniting quiet performance with high-power performance gains
- Matched and manufactured for select chassis
- Patented Megaphone piping structure to produce excellent torque and throttle response throughout the power-band. This piping design allows for a swirling exhaust gas flow effect that has for years produced proven results

Bolt-On Yes
Part Number 164KF001
Year 2015, 2016, 2017, 2018, 2019, 2020, 2021
Make Subaru 
Model - WRX (FA20)
- STI (EJ25)
Body Style 4-Door Sedan
Engine - FA20 (WRX)
- EJ25 (STI)
Chassis VA
Exhaust Type N1-X Evolution Extreme Muffler
Piping Diameter 76.2mm. -> 63.5mm. x 4
Tip Diameter 93mm. x 4
Pieces 4
Exhaust Tip Style Titanium Round- Dual wall rolled, Angle cut (Riveted) 
Piping Material SUS304 Stainless Steel
Muffler Material SUS304 Stainless Steel
Muffler Tip Material TP270 Gr Titanium Tip
System Weight -
Sound Level Sound Level: 94.4 dB @ 4,500 RPM
Special Notes NOTE: Do not use harsh chemicals or metal polish cleaners when cleaning titanium tips. We recommend using standard isopropyl alcohol
WARNING: California Prop 65
Cancer & Reproductive Harm 

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