longdaddy

if the car was tuned, you could hear popping sound on deceleration as the unburned fuel ignites in the exhaust. not good for your cat converters

another issue I had is the pipe that connects the muffler to the midpipe slightly bending with time, which changes geometry of how the exhaust is mounted and it starts hitting various things (which could also sound like a rattle).

kerryt1

Probably not the cat-back. I'd bet it's the h-pipe. I had a similar issue that was cured when I switched to longtube headers and a new x pipe.

Shinobi'sZ

Just to let the OP know that after I took off the Ti exhaust all rattling went away...as mentioned with the mufflers off I can bang on the outside of both mufflers and hear rattles. Seems to be a durability issue with some. These were off an 03 Z too...as I sold my original Z06 Ti exhaust back in 2003. I also never had the rattle with the Borla Stingers....as mentioned I put these 03 Ti exhaust on recently and they were good for about 1 month..then after some hard accelerations they started to rattle...I think it is safe to say that what ever packing is in them...can come loose. It may just take longer for other depending on the way they drive or maybe the actually quality control during assembly.

Rather then assume just tell your mech or you can actually just lay down on the ground and bang on the mufflers with the palm or you hand...it was obvious when I did it...even without a stethoscope.... I also used a stethoscope up and down my whole exhaust system when it was on my lift and not running...then started the car and listened again for the same rattle...it was ALWAYs present in the mufflers...so you should be able to hear it.

TGstring

are they packed with something (like a normal passenger car muffler- like steel wool, etc.)
or
are they purely baffled (like a flowmaster- no filler at all- just metal baffles)??

there was a big debate and noone was able to provide pics a little while ago.

rudyarias

My Ti exhaust has heald up with no issues at 160k. The flanges indicate that Teneco (Walker) is probably the OEM supplier and is baffled.

TGstring

Negative.

TiMet is the company that did the OEM C5Z exhaust...

I do not believe they have anything to do with Teneco.

A pic of the C5Z muffler opened up is one of the most elusive pics to be found online and in this forum.

HTH,
Tommy

rudyarias

The flanges on my Ti exhaust has a teneco/Walker number on it. I know that Teneco makes most of the OEM exhausts for GM.

speedyhawk101

My Z06 rattled on decell just as you are describing. it did this when I bought the car with 70K on it.

I installed Long Tubes, X-pipe and did the Ti bypass mod and I have not had any rattles since.

Titanium if not welded properly will get brittle and over time cracks will most definately occure. I work on Aircraft and our section has a weld shop that sees quite a bit of titanium weld repairs. Keeping the material cool is very important when welding.

I highly doubt that the titanuim has issues withstanding the heat generated by the LS6 even the Turbo LS6. Titanium is used on many turbine engine components and is a good choice for race applications and aviation due to it's strength, light weight, and Low thermal conductivity. It does lose strength in heat above 800* F.

ptindall

That's weird. This thread was brought back from the dead two years to the day from when it died.

NemesisC5

speedyhawk101

Texan1Z06

My Z does this same thing as described by the OP, right down to the temp. at which it occurs, identical.

Can anyone recommend an exhaust that most closely reproduces the same decibel level/sound quality at idle, cruise and WOT as the Ti exhaust?

Does anyone know what oem replacement mufflers cost?


Thanks!

DIYdreamcar

I personally would look here on the forum and find myself a nice used set and see if the a welder could fix the old one after taking the muffler apart.....

-Ed

speedyhawk101

Mine stopped after installing Long tubes and X-pipe. Had the Ti-bypass mod done as well. Sounds great.

Texan1Z06

I understand that some issues are cleared up by using an x-pipe..but if the mufflers are bad and internally breaking down, how can that completely be the issue? I'm assuming my mufflers are the cause here based on the op's comments.

which x-pipe? name and price?

Not sure the exact reason for the bypass or if anyone does that here in Houston. But I will be reading thru this thread tonight.
http://forums.corvetteforum.com/c5-z...-complete.html



thx

tlc0706

KEWL...a dead thread that folks still don't know the answer......can't believe someone with a bad set and fire-breathing hacksaw hadn't solved this..

EBM_Z06

Being the thread starter, I just wanted to update everyone. I didn’t do anything on the matter since I was hoping that the problem might solve itself by switched to an X-pipe when I installed the LT headers a while ago. Well, the “problem” still exists, when the car is decelerating after being run hard.
I did a small video that should be able to show everyone the rattle sound I’m talking about. It’s noticeable as soon as I let off the accelerator before running into redline in order to shift into the next higher gear…. It can also be heard as soon as the car in the video is no longer insight, that’s when I let off the accelerator too.
Maybe other people who have the same complaint can verify if this is the same rattle their getting.

http://www.youtube.com/watch?v=qVW9cciO1k4

longdaddy

I have never heard a noise that's anything like your video, are you 100% sure it's the muffler?

EBM_Z06

Well, what else could it be ? Since the only stock part of the exhaust is the Ti catback. Headers, Xpipe and high flow cats didn't do anything as far as changing that noise.

longdaddy

something mechanical? Can you reproduce it with/without operating the clutch?