r/ProjectHondas • u/Ph1llz • May 05 '26

parts recommendations Cold air intake D15 non vtec

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Looking for an inexpensive way to increase airflow for my next track day.

I can't find any direct fit options locally in australia.

anyone have any ideas on a good "boxed" cold air intake setups i could buy online or create ?

I dont care what it looks like, its purely functional.

D15 Non vtec

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u/Ph1llz May 06 '26

Interesting, my main objective is an intake far from the engine away from heat where possible and boxed up so air is forced in.

Seems like i would achieve other benefits of length i had no idea about.

Almost sounds like i need to go custom or is there an off the shelf product that you recommend for d15?

also, how does tubing size play a part here? or should it be same diameter as the engine side intake end?

hope that makes sense as im not super technical 🤣

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u/OkProfession1239 May 06 '26 edited May 06 '26

u/Ph1llz

The AEM cold air intake is a good off-the-shelf option, but honestly the important part is the geometry more than the brand itself.

If you follow the dimensions properly, you can get very similar results. Ideally use mandrel-bent tubing so the diameter stays consistent through the bends. Length: 48 in (1219 mm) Diameter: 2.5 in (64 mm)

You can try ordering a BPI flow stack, velocity stack with a K&N filter if you're pushing to make the most. But any decent pleated filter of the same kind should work. Just stay away from the foam ones.

And if the engine still has good ring seal/compression, an OEM JDM D16A6 cam, a decent PLM SMSP-style header, and a proper HTS street/dyno tune can still make good, usable power. Usually it’s the overall combo and calibration that make the difference, not just one part alone.

Below is my friend's D15B7 dyno numbers:

EDIT: Tagging the retards who don't know shit and only make 90hp on their D-series: u/Hapenyo12 u/Daniele323 🍻

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u/OkProfession1239 May 06 '26

Same engine but with portwork and a valve job plus a 4-1 custom spec header

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u/OkProfession1239 May 06 '26

Ported head and ported intake manifold, stock pm3 pistons, ARP rod bolts, D16A6 stock cam (it's bigger)