Noisey Rattle from Cat

grazza · **Joined:** Sun Apr 26, 2009 8:05 am **Posts:** 15

Started to get a vibration at about 3,000 rpm, any ideas???

PaulSmith · **Posted:** Wed Feb 24, 2010 3:17 pm

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)

Porsche · **Posted:** Wed Feb 24, 2010 5:23 pm

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.

AlpineTurbo · **Posted:** Wed Feb 24, 2010 11:08 pm

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).

PaulSmith · **Posted:** Thu Feb 25, 2010 12:29 pm

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

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Noisey Rattle from Cat

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