RSX

The best aftermarket parts for the Acura RSX start with the K-series engine's breathing: headers and cat-back exhausts are the classic first upgrades, since the RSX Type-S responds well to bolt-ons. A quality intake, upgraded cooling, and shifter hardware round out a balanced street build. Most of this collection is built around the 2002-2006 RSX and its K20 engine, including parts that fit K24-swapped applications — check each listing's fitment notes to confirm Type-S vs base and your model year.

The RSX's K-series is one of Honda's most mod-friendly platforms, and this collection covers the parts that matter: K-series headers from PLM, cat-back exhausts like the Invidia Q300 for the Type-S and the Buddy Club Spec II, cooling components from CSF, and shifter hardware. Featured picks: the PLM Power Driven K-Series K24 Header and the Invidia Q300 Cat-Back Exhaust (02-06 RSX Type-S).

Shopping for other Honda platforms? See our Civic Si, 2006-2011 Civic Si, and S2000 collections — much of the K-series aftermarket crosses over between these cars. For the case for upgrading your exhaust first, read 6 Reasons Why Upgrading Your Exhaust Is Really Worth the Investment on the JDMuscle blog.

Will a Type-S header fit a base RSX?

Not directly — the Type-S K20A2 and base K20A3 have different exhaust port configurations and catalytic converter placement. Buy the header built for your exact engine code.

Do I need a tune after intake, header, and exhaust?

Bolt-ons work on the stock ECU without a tune, but a proper tune is what unlocks the full potential of the combination and keeps air-fuel ratios safe.

Is a cat-back exhaust difficult to install?

Most RSX cat-backs are bolt-on using factory mounting points — basic hand tools and a couple of hours. The main challenge is usually seized exhaust flange bolts on older cars.

Does a short ram or cold air intake make a difference?

An intake improves throttle response and engine sound on the K-series. Power gains are modest by itself; it shines as part of an intake-header-exhaust combination.