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.

PRODUCT FEATURES:
- 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  www.p65warnings.ca.gov