A'PEXi - N1 Evo Extreme (Midpipe) - 2014-2020 Lexus IS250 / IS350 (RWD/AWD) / 2016-2020 IS300 (V6-AWD) / 2021+ IS350 (V6) - **Preorder- ETA Lead Time Late July**

APEXi SKU: 144-KT02


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Drivetrain: RWD

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N1-X Evolution Extreme Midpipe Kit (Resonated)
2014+ Lexus IS250/IS350 AWD/RWD

The N1 Evolution Extreme is based on the proven performance basics of the N1 muffler. Optimum exhaust efficiency is achieved through the mid-pipes running parallel between the catalytic converter and rear muffler section. The H-style piping design was opted to equalize the pressure in both exhaust pipes. Our unique modular design allow the mid-pipes to be interchangeable with the factory OEM exhaust system components along with the rear section which is sold separately.


  • 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
  • Compatible with the N1-X Evolution Extreme rear section part number 164-KT02 (2014-2016), and 164-KT13 (2017-2020).
Bolt-On Yes
Part Number 144-KT02 (RWD)
144-KT09 (AWD)
Year 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024
Make Lexus
Model IS250, IS300 (V6-AWD), IS350
Body Style 4-Door Sedan
Engine 2GR-FSE, 2GR-FKS
Chassis GSE31
Exhaust Type N1 Evolution Extreme Muffler (N1-X)
Piping Diameter 65mm. x 2
Pieces 3
Piping Material SUS304 Stainless Steel
System Weight Mid-pipe only 27.67 lbs. (Stock- 32.52 lbs.) 4.85 lbs. lighter than OEM
Special Notes Sound Level (with part # 164-KT02): 87.0 dB @ 4,500 RPM. Modular design-> Mid-pipe and Rear Section can be interchanged with factory exhaust components.


- Front Section (Header to Midpipe) : 3901-0700
- Mid Section (Center of the Midpipe Kit) : 3901-1660
- Rear Section (Connecting to Rear Axleback) : Factory OE Donut Gasket (Lexus OE Factory product)
WARNING: California Prop 65
Cancer & Reproductive Harm