Problem after installing trickflow upper plenum

[Jbauer]

I installed the trickflow upper plenum, now i get a whistle. It only happens at about, i'd say 1/4 throttle. Its bolted to the stock throttle body. I can't figure out why its doing this; when i tightend down the bolts that secure the the upper plenum to the lower plenum, i heard a crack, so i thought i may of damaged the lower plenum, but the car drives and idles perfect, theres no whistle at idle. I have a feeling that this isn't normal operating sound, although, it does sound pretty good.
Can anyone offer any help or advice?
thanks

 

[SVT32VDOHC]

If you heard a crack I assume you cracked the lower intake. There are steel thread inserts into the plastic. Even a hairline crack will cause a whistle.

 

[Jbauer]

but wouldn't it whistle at idle if the intake manifold was cracked?

 

[SVT32VDOHC]

You would think so. I have heard others having whistling problems after this install. Try a search because I think it has been covered once or twice recently. Also, maybe it just doens't happen until you get more air flow.

 

[stal94gt]

i had the same issue when i put that plenum on. and every one else i know has that whisle to. i think it is cause it is such thin aluminum compaired to stock you hear it.

 

[Jbauer]

SVT, i dont think its because it has more airflow that it sounds off at 1/4 throttle, when i floor it, it goes away. only at part throttle (where i usually drive..) can i hear it.
Stal, did you change plenum to another brand? if so, did it go away?

 

[fobra559]

I have a C&L plenum with a Accufab tb and I hear whistle at low speeds also but then goes away when I'm at higher speeds. I hear a lot of others saying that their C&L whistle too so I wouldn't worry about it much.

 

[COramprat]

Never had an issue with the Trick Flow.

Did you replace the gasket?

 

[Jbauer]

which gasket? the ISV and EGR gaskets were re used, and so was the throttle body gasket.. i'll try replacing the throttle body gasket..and then i'm going back to the stock plenum to see if it keeps making the sound..if it doesn't, i'm throwing the trickflow out and putting in a BBK or something.

 

[VIRstang]

I installed the TrickFlow plenum with stock throttle body and I have no whistle. I seem to have a much better throttle reponse. I love the install!!

 

[Jbauer]

I just put my stock piece in..no whistle.
the trickflow piece has jagged up edges and stuff, nearly cut me, real real poor cut. I will never buy another trickflow product again. I'm returning this POS, and buying an Accufab product.