rocsix

i have a k+n filter and i took off the top cover for the first time, and i notice a low whistle.
anyone else??

for those who have CAI, is there any particular sounds?

EDIT: This is on IDLE

starchland

yes i took the cover off once on a cold night, and the car seemed much more lively. could have been the extra noise too.

the stock intake box is designed/tuned to quiet any noises like your hearing.

takeshi

No whistling with my CAI.

xrapidx

My drop in filter had a whistle - actually so does my FIPK now.

00CivicSi

The whistle is normal with the cover off on the stock box. I'd imagine you might also hear it with a drop-in filter and the cover off of the stock box.

Saki GT

Whistle or hum - its normal. All the cover does is muffle the sound, but its always there.

2slow2Bfurious

good to know, i freaked out a little the first time i heard it after removing the cover.

CapoArgentino

Just some good advise: If your going to be running the stock air box, keep the lid on. Having the lid removed causes the engine to suck in plenty of hot air from the engine bay and power will significantly decrease. I know it sounds 'cool' with the lid off under acceleraton but its not worth it IMO.

Some people rock the stock airbox with a Spoon snorkel running to the front grill. Do a search in the forums as there are plenty of threads on this.

ahrmike

my KN FIPK makes less noise now because I butted up the tube to the throttle body. it made a nicer growling noise when I left a gap there (unintentionally).

Saki GT

Not true, but a popular myth.