I have a 2005 accent and I was looking for air filter. I wanted to change
stock for a K&N filter when I read about a guy that just took off the black
box that connects to the stock air filter. He wrote that it helped the
performance of the car and the sound, but I wanted to ask you guys how this
affects the car, does it really helps or does it actually damage the car
I wouldn't modify the air intake system or use a K&N filter unless you
plan to race the car and don't care much about engine life. K&N filters
will flow more air which may help performance, but they also flow more
dirt than stock filters. You are trading shorter engine life for at
most a very slight performance increase, probably not even noticeable in
Cutting up the airbox may affect the operation of sensors such as the
mass airflow sensor and others in and around the fuel injection/intake
system. This may well hurt your performance rather than help it.
Unfortunately, modern cars don't lend themselves well to piecemeal
performance improvements. You really have to treat the engine as a
system and each part you add must be designed to fit into that system.
Sure, a lot more performance can be add with aftermarket accessories,
but they must be designed and installed together typically to get the
benefit. Casually adding bits and pieces often doesn't yield much and
runs the risk of destroying driveability.
I agree with Matt. I know a bit about filtration and many of the claims
that K&N makes are bogus or at least seriously misleading. Every
comparison test I've seen of filters has shown that K&Ns are less
effective at removing dirt than other brands. Also, you have to be very
careful when re-oiling them as excess oil can contaminate the MAF sensor
and damage it. It's not cheap to replace.
As for the sound, who are you trying to kid? It's a compact economy car
with a small, low-horsepower engine. It's never gonna' be a race car.
What good is making it noisy going to be?
On the Elantra, disconnecting/removing the resonator that's in the front
fender does improve air flow and reduce intake air temperatures without
creating excessive noise or any problems with the operation of the
engine. In fact, it can improve fuel economy slightly. I don't know if
disconnecting the resonator after the airbox on the Accent would have
the same effect. I would not remove the resonator that's attached
between the MAF and the throttle body, as it may cause a severe hum in
the intake. That resonator is there strictly to reduce intake noise and
has no adverse effect on performance.
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