The K24A2 in your 2004–2008 Acura TSX is one of Honda's finest four-cylinders — 200 horsepower, i-VTEC on both intake and exhaust cams, and a willingness to rev that puts most modern engines to shame. But from the factory, it breathes through a plastic airbox filled with resonator chambers and a restrictive panel filter designed to keep things quiet. The engine is capable of more — it just needs the air to get there.

Flashark's cold air intake kit replaces the entire factory intake assembly with a Φ76mm (3-inch) mandrel-bent aluminum pipe flowing into a high-flow dry cone filter. The pipe features dual integrated breather nozzles to retain the factory PCV and vacuum line connections exactly as Acura designed them — no check engine light, no deleted emissions plumbing. A Φ76→Φ70mm reducer coupler ensures a tight, leak-free fit at the throttle body. The result is sharper throttle tip-in, stronger mid-range pull where the K24 does its best work, and that unmistakable i-VTEC induction roar when the second cam lobe kicks in.

Installation is genuinely bolt-on: the integrated bracket lines up with factory mounting holes, all hardware is included down to the anti-vibration mount, and the job takes 45–75 minutes with basic hand tools. The dry filter requires no oiling — periodic cleaning with compressed air keeps it flowing for years. This isn't a universal kit with adapters and zip ties. It's purpose-built for the TSX.

Key Features

Φ76mm (3-inch) mandrel-bent aluminum intake pipe — Single-piece construction with matte black powder-coated finish; smooth internal bends maintain airflow velocity from filter to throttle body

K24A2-specific breather design — Dual integrated nozzles on the intake pipe retain factory PCV and vacuum line connections exactly as designed; no deleted emissions plumbing, no CEL

Φ76→Φ70mm reducer silicone coupler — Heat-resistant airtight coupler ensures exact fitment at the throttle body connection; no universal slip-fit slop

High-flow red dry cone filter — 120mm top / 155mm base / 132mm height, Φ76mm inlet; dry cotton gauze media requires no oil — oil-free means zero MAF sensor contamination risk

Integrated mounting bracket — Lines up with factory mounting points for true bolt-on installation; includes anti-vibration mount to isolate intake from engine movement

5–10 WHP on K24A2 — Honest gains for a 200hp engine with a well-designed factory intake; the improvement you feel is sharper throttle response, not just a dyno number

i-VTEC induction sound — Unlocks the K24's signature intake growl, especially above 4,500 RPM when VTEC engages; aggressive under load, refined at cruise

Complete hardware kit included — 1× filter clamp, 2× narrow band clamps (65-89mm and 59-82mm), 1× anti-vibration mount with M6 threads, washer, M6 lock nut, vacuum hose adapter

45–75 minute DIY install — Bolt-on with basic hand tools (socket set, screwdrivers); no cutting, no drilling, no permanent modifications