williamGT

iTrader: (5)

Just found out that the flex pipe is leaking thats what made the whistle noise.

neilownz

Did whoever installed it put a lot of strain on it trying to shove it up into place?

williamGT

iTrader: (5)

not sure, I wasn't there.

higsy

Is it the flex section or the weld. There's at least 6 here that have the same problem, sounds like a production issue. My car sounds like ****.

CenTexSS

iTrader: (2)

That's cause you got the free set lol

williamGT

iTrader: (5)

I put exhaust sealant around the top weld of the flex pipe, still made the noise, but I here its normal.car goes to GM on Friday.

williamGT

iTrader: (5)

only whistles when the car is warming up.

AlabamaGuy

iTrader: (5)

I've got the whistle at different rpm ranges and load levels

Mels SS

iTrader: (1)

Same here!!

williamGT

iTrader: (5)

Is it over 2700 and up RPM's?

DavidGXP

iTrader: (14)

Mine makes some weird noises too, especially when warming up. It also sounds like hell when going back into 8cyl. mode. Makes a rattle noise from under the car, kind of sounds like a rod rattling.

AlabamaGuy

iTrader: (5)

When I crank it up, when at WOT, when under heavy load in passing gear.

williamGT

iTrader: (5)

ummmm, I should find out this week what it is, and BTW Nick said they uses ZZP inerlock flex pipes.

williamGT

iTrader: (5)

Same here and down shifting.

AlabamaGuy

iTrader: (5)

If I could find the leak I'd just weld that thing up lol

higsy

Same here. Had my E cutout welded up at a performance shop and he had a quick look at it with a few of the mechanics and said he thought it was an air intake issue where the engine is wanting more air. I've got a k/n (fwi) and stage 2 intake mani and only get the noise at wot or throttle bursts. He suggested taking the k/n off and do a quick run up the road.

higsy

Anybody call Thorley yet ??

LS4SPEED

iTrader: (3)

Is it part of that pipe I sent you? If so, the warranty has expired! Sorry!

williamGT

iTrader: (5)

I bought the downpipe off you, were talking about the headers flex pipe.
I called nick at thorleys the other day, he wants me to find out if its a leak or just a whistle.

Aplusdetailshop

iTrader: (1)

Guys Honestly, I have no clue why they put a flex pipe between the heads over the trans. There's no flex in that area it doesn't make any sense at all. The only place it should've been was at the end of the down pipe. Cause thats where the flex is. I haven't installed my headers yet but after reading about this noise I'm thinking of removing that flex pipe and welding it solid and adding a flex down below. Unless DT offers a cross over to fix the breaking and the whislte issue.