Apexi

The best A'PEXi parts for most owners are its model-specific cat-back exhausts: the N1 Evolution-R for the 22-26 WRX and the N1-X Evolution Extreme for the 23 and newer Civic Type R and the BRZ and GR86. This collection also covers an N1 Type EXV suspension kit for the WRX, a panel filter for early WRX and WRX STI, and rear mounts for FR-S and BRZ, so check your year and model before ordering.

A cat-back replaces the exhaust from the catalytic converter back, where sound, flow, and the visible tailpipe finish are decided. It is usually the first exhaust step because it changes the car's character without touching emissions hardware ahead of it. Suspension kits control ride height and body movement, while a panel filter is the simplest intake-side upgrade here.

Brands in This Collection

A'PEXi, listed here as APEXi and Apexi, is the only brand in this collection, and the products show a Japanese performance range built model by model rather than as universal parts. Its N1 exhaust naming runs through the whole catalog: the N1 Evolution-R cat-back for 22-26 WRX, and the N1-X Evolution Extreme cat-back for the newer Civic Type R and for BRZ, GR86, and FR-S applications covering both generations listed. Choosing between those systems starts with fitment, not sound clips, because each is built for a specific chassis.

The same approach shows in the supporting parts: the N1 Type EXV suspension kit for the 22-26 WRX, a panel filter for 02-07 WRX and 04-07 WRX STI, and rear N1 mounts for 2013 and newer FR-S and BRZ. That mix suits owners who want one brand across a build, especially on older cars where the filter and mounts address wear items too.

For exhaust alternatives, Remark is known here for model-specific cat-backs with a choice of tip finishes, and Invidia is the other Japanese exhaust range owners compare on sound and layout. HKS is the broader Japanese alternative, covering exhaust alongside forced induction and engine parts. Shop the wider suspension range and lowering springs if the EXV kit is part of a larger chassis plan, then read our top cat-backs for the 2022 and newer WRX and best coilover for WRX guide.

Frequently Asked Questions

Does a cat-back exhaust require a tune?

A cat-back alone is commonly fitted without changing engine calibration, because it sits behind the catalytic converter. If you change parts ahead of it, such as a downpipe, tuning becomes a separate question for your exact setup.

What is the difference between the N1 Evolution-R and the N1-X?

They are fitment families first: the Evolution-R is listed for the 22-26 WRX, while the N1-X is listed for the newer Civic Type R and the BRZ and GR86 range. Check your year and model rather than choosing by name alone.

Is the EXV suspension kit a full replacement?

It is listed as a suspension kit for the 22-26 WRX, so plan on installation and a professional alignment afterward. Any ride-height change alters alignment angles and can cause uneven tire wear.

How difficult is a panel filter change?

It is the easiest job here: a panel filter replaces the factory element in the stock airbox, with no cutting or tuning. Confirm the 02-07 WRX and 04-07 WRX STI fitment matches your car.