What is that whistling sound like air being sucked in when you get on the throttle. Is it the intake? What mods amplify that sound? I have the MREV+ and 5/6" spacer.
When one mentions intake sound do they refer to that whistling sound or something else?

 

you check under the hood? you might have a supercharger

 

If you don't have a CAI it sounds like a vacuum leak.

 

^

+1

 

hmm but i thought you idle roughly when theres a vacuum leak?

 

I had a faint whistle with just the ztube & drop in filter. The car only had 50 miles so I know it was not a vacuum leak. It was amplified and appartent with an intake I put together from my old maxima and 5/16 md spacer that was put on at 200 miles.

 

i think it's just the air coming through the engine or it's your z-tube if you have one...i hear the whistle too...i did a vaccum test and my car is perfectly fine

 

it is from the intake mine is pretty noticeable

 

popcharger will give you that whine and its amplified with the motordyne...that sucking noise added with the grumble of the z tube and the topspeed headers plus the stock exhaust (amplified due to headers) = SEX!

 

I guess I'll stick with the motordyne..
What sound do headers make ? The sucking sound?
lol its beginning to sound funny.

 

the headers will give it like a growl down low...i dont really know how to describe it..almost sounds like a v8 grumble..of course not as pronounced but its there...sounds awesome

 

i noticed that when i had my 5/16 spacer + mrev2 installed, when reved to about 3500 rpm's i heard a slight whistle of air not sure if this is normal

 

yeah thats what i heard and LOVE

 

anyone also feel like a knocking at idle? i felt a slight knocking of the engine like once every 20-30 seconds only when the car is at idle though

 

its all intake!!