theturkster

Hi guys

I have a question for all the exhaust experts out there who can help me with a few issues im facing with my headers/xpipe install.

After installing the the headers and xpipe, i noticed this very strange and annoying rattle combined with a really loud "shooshing" sound... it doesn't sound normal at all. at first i thought that there was a leak and took it back to the shop to have it looked. i was told that the system was fine and that what im hearing is normal.

what makes me say that its not normal is that these sounds come and go. i tried to record it from my phone and well it didnt come out all that great.

thanks in advance.

olszowa12

Did You contact MBH ?

theturkster

yes, and didnt get much help from them.

Maverick1975

The shooshing noise might possibly be the sound of the exhaust gases going through the collector of the long tubes. Some designs can have that downside to them

BAD430BENZ

the rattle is probably coming from the cross brace under the exhaust . just remove it

i think you might have some sort of exhaust leak somewhere

you are correct because some headers have slip-fit collectors which cause that sound but i don't think MBH has slip-fit collectors . i have their complete setup and i don't get any shooshing noise .

HoozyerdaddyC63

I've got MBH LTH, Mids and X-pipe and have some rattling sound and vibration coming from the center passenger side of the car. Before I post up pictures and everything I wanted to make sure I get it back in the shop to investigate.

Merc63

There is an aluminum brace in the middle of the car.

The exhaust will start to rest on it and rattle. Remove it.

The system needs to be tightened after its heat cycled a few times. Check all bolts.

PetroC63

^
This.

Same thing happened to me when I had my MBH system. Once the brace was taken out of the equation no more rattle.

HoozyerdaddyC63

After it is heat cycled a few times and it get's tightened again, will the brace still be an issue? I'd like to keep it on the car if I can.

BAD430BENZ

the brace will most likely always be an issue if it is now . you could always have an exhaust shop make some sort of bracket to possibly hold it up above the brace . i can tell you right now that removing it will do absolutely nothing to the car .

BO Knows

The also have MBH, I have minor rattles from 2 placed. When going over speed bumps, I think the headers are rubbing against the firewall:

The O2 sensor also sometimes rubs on the black plastic under panel:

tailhappysg

If the aluminium brace is still there, it could be the cause. I had both knocking and "shooshing" sound after installing X-pipe. Both went away when I removed the brace.

M156Beast

Can somebody please post pictures of the Aluminum braced brackets?

Merc63

It's right before the resonator.

I tried spacing mine 1 inch, tightening everything with the system pushed up. Nothing worked, I finally just removed it.


Bo knows: looks like someone didn't follow their jig to spec on those.

BO Knows