aftermarket intakes take their air from inside the engine compartment,
not outside, so they're sucking hot air, not cold. also, they're made
of metal which retains heat nicely. honda thoughtfully provide a
plastic intake which doesn't retain heat, that sucks cold air from
outside when moving, warm air from inside when not to prevent icing, and
is designed to minimize risk of water ingestion. it also incorporates a
highly efficient air filter that works down to a much smaller particle
size than the type of filter you'll be looking at. more particle
ingestion means shorter engine life.
and even if you do this "upgrade" you'll still not get that much out of
this motor - the cam is pretty restricted - no top end. you'll get much
better results from a "mini-me" upgrade, or better yet, a b-series motor.
oh, last thing, check your local emissions laws. here in california,
it's supposed to be illegal to touch the catalyst while it's still under
warranty mileage - you can't replace the header on the dx without
removing the stock catalyst.
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