High Pitch Sound From Main Cat

[nctan]

Hi Guys,

I am driving a IS200 and recently I had my 2 x pre-cat removed. My Main-Cat is stock. But whenever I reach High RPM around 4000-5000 rpm I could hear a high pitch sound coming from the main-cat.

Any idea on how I can fix it?

BTW is it normal that stock exhaust will sound louder with the pre-cat removed?

Your help is greatly appreicated

Thanks

N C

[nctan]

Hi,

Is there anyone who can help me on the mentioned issue?

Rgds

N C

[Rob]

how do u know it is coming from the main cat??? did u use new exhaust gaskets when the exhaust was refitted?

[nctan]

Hi, I use my hand to depress the petal while looking undercarriage and notice that high pitch sound coming from the cat during high rev.

BTW what is exhaust gaskets?

[Rob]

the gaskets are the seals between the front /middle/ rear sections of the exhaust - i was thinking of these are not sealing properl then the sound can be caused by air escaping

[nctan]

Hmm, thats possible..... The workshop actually removed some kind of stock casing between the exhaust manifold and the main cat.

Thanks..........