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Noisey Rattle from Cat
https://forums.tipec.net/viewtopic.php?f=25&t=7923		 Page 1 of 1
Author:  grazza [ Wed Feb 24, 2010 2:55 pm ]
Post subject:  Noisey Rattle from Cat
Started to get a vibration at about 3,000 rpm, any ideas???
Author:  PaulSmith [ Wed Feb 24, 2010 3:17 pm ]
Post subject:  Re: Noisey Rattle from Cat
It could just be the heat shield around the outside of the Cat. Mine did this about 10 years ago and I pulled it off with no adverse effects ever since. If it is the insides of the Cat finally breaking down, then as long as your car is older than a K reg you can have the Cat cut out and replaced by a welded in piece of pipe (Normally around £100 all in depending on were you go)
Author:  Porsche [ Wed Feb 24, 2010 5:23 pm ]
Post subject:  Re: Noisey Rattle from Cat
The heat sheild started to rattle on mine shortly after I bought it. I took it off, but just watch that you don't park it up on long dry grass in the summer. I think the heat sheild was to stop the car bursting into flames in just this sort of scenario.

I later got rid of the cat all together for a stainless steel bolt on bypass section.
Author:  AlpineTurbo [ Wed Feb 24, 2010 11:08 pm ]
Post subject:  Re: Noisey Rattle from Cat
For those of you who ditched the cats on your S2s, how much louder was it without the cat and the straight cat in place? I am running a non cat S2, but the silencer probably doesn't have miles more life left in it. I know a replacement silencer from Porsche is £600 on a non cat S2. Call me a skinflink, but I am trying to weigh up the alternatives (I believe the cat section may not fit it, ProMax's Cat Bypass requires the downpipe to be cut, other options are welcome).
Author:  PaulSmith [ Thu Feb 25, 2010 12:29 pm ]
Post subject:  Re: Noisey Rattle from Cat
It is louder, but not overly so, and nowhere near some of the 'boy racer' exhausts on small hatchbacks.

I am not one for loud exhausts on simple 4 pot engines and I find mine bearable without the cat and do like the extra rorty noise in the upper reaches of the rev range 8)
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