What is involved, is it new zorst section, do u just bray innards out (dont laugh i know of people doing that) are there any electrical implications and what are the costs/benefits??

De Cat is to get rid of the catalytic converters in the down pipes of the exhaust.

 

Benafits,

Engine has a quicker responce,

Turbos spool up quicker,

Exhaust louder,

Some say better MPG.

 

Bad things,

Turbo seals MAY not last as long

Exhaust may be too loud for some

but do u replace pipes or just take cats out do u need to re wire anything ???

Jap cats have a cat temperature wire on then I think. If you get whole new pipes there is no place for the wire to go so the warning light may stay on. The pipes will cost about £200.

 

Or a mechanic should be able to cut open the pipes and take out the cat and seal it back. This is cheaper and the temp sensor still has a place to go.

 

People say that getting new "test pipes" as they are called, is better then gutting the cats.

 

Stuart

Two points :-

 

The cat temp sensors do nothing except light up the warning light on the dash, there's no need to cut the wires, you can just unscrew them from the cats and threadle them back through the hole in the floorpan from whence they came - don't forget to put a rubber bung in place to stop water getting in.

 

Secondly, IMHO just gutting the cats effectively creates an expansion chamber partway down the exhaust. No technical background to this but I don't think this will be ideal for gas flow. Therefore, getting de-cat pipes will probably improve gas flow, but neither will affect back pressure. You can also get de-cat pipes with small straight thru silencers approximately where the cats were. Once again, no difference to back pressure but it may take a little more of the noise out. Much of the really harsh exhaust noise is damped by the turbo, so de-catting a turbo car has a less dramatic effect on volume than on a non-turbo car.

"What is de cat?"

 

It's at the front of de exhaust, underneath de car.