cherrygxp

I put my downpipe on this weekend and somethings leaking like hell. I put it on and took it off like 3 times trying to check everything and make sure it was tight. The leak can only be heard when im under heavy acceleration and i could hear it this morning cuz it was soo cold. But once it warms up its fine under normal driving conditions. So what im thinking is do i need a different gasket where it meets the manifold. The gasket i used is a new one but does hogan sell a different size or something??? also could it be leaking through the flex? i might just try to wrap the flex with exhaust tape and see if thats the problem. I bought it used and everything looks fine but............

LS4SPEED

iTrader: (3)

I don't know, I bought mine used also. I got my gaskets from the dealer. Did you put the manifold gasket in backward? I'm not sure if that would do anything or not? But might be your culprit.

Brian396

iTrader: (3)

I reused the factory gasket with no problems so I don’t think that would be the problem.

cherrygxp

i bought a new gasket and installed it correctly thats why im thinking it might be the flex???

LS4SPEED

iTrader: (3)

The only problem I had/have is the usual CEL, PO420? But that's why I bought the tuner at the same time!

cherrygxp

did you all torque yours to the spec or just crank the hell out of it. maybe i overtightened?

LS4SPEED

iTrader: (3)

Just gave the old German torque, ya know, Gudentight!

cherrygxp

hmmm i dk but its pissin me off

LS4SPEED

iTrader: (3)

Ur prolly right, I bet the flex is fucked, sounds like you got screwed!

cherrygxp

yup im gonna wrap the **** out of it and see what happens

cherrygxp

anybody got any reason why i shoulds wrap the flex?

cherrygxp

Does the manifold gasket go one way or can it go either? aka reversible?

07carlocrusader

I bet ya that gasket is on the backwards!! This is just like the old manifold or headers= Has the "putt-putt" sound until that "bad" gasket warms & expands!! My best advice is to go back and check that gasket first before wrapping that flex!!

Brian396

iTrader: (3)

While you got it off, throw a strait edge across the flange. Make sure its not tweaked.

cherrygxp

ya just tried wrapping it. no better. it doesnt get better when it warms up. I called the dealer and they said the gasket is reversible. I hate working on the ground so im just gotta wait till i get my lift in. thanks guys

cderry

iTrader: (1)

Anyone have the dealer part number on these?

CenTexSS

iTrader: (2)

Both of mine had a slight tick, it's been explained as a resonance when the exhaust gases hit the walls of the DP. But when I took 'em off I saw no visible signs of a leak.

Run it for a week or so and take it off and check for carbon on the gaskets.

monte_with_a_LS4

iTrader: (4)

on what? the gaskets?

cderry

iTrader: (1)

Yeah. Sorry.