mine sounded crap with decat pipe and still had centre section and rear box, but mine was just a straight thru pipe had no baffles of any sort.

i've put cat back on now cos it sounded so bad

thanx u guys x

quote:

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Originally posted by MikeH

quote:

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Originally posted by Ditch
modern exaust systems contain a catalytic converter to reduce emissions.

It is now a legal requirement.

A de-cat pipe simply by-passes (removes) the Catalytic converter and maybe open up a little more power as the cat will restrict exhuast gas flow.

generally exhaust systems without a cat will sound raspy

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Why don't older cars without them sound raspy?

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Standard inlet is restrictive and longer.
Gives more power due to increased airflow and sound like your exhaust would if you chopped most of it off!
Without the rasp!

[Edited on 02-09-2003 by Wolf In Welsh Clothing]

OK stupid question but.... why are throttle bodies such an improvement?

Are they just better ones than the originals?

My janspeed one aint raspy, its more of a box than a pipe though.
My corsa sounds well deep, pretty unique sound to it with different inlet.
Throttle boddies are just the best sound ever though!

quote:

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Originally posted by Ditch
modern exaust systems contain a catalytic converter to reduce emissions.

It is now a legal requirement.

A de-cat pipe simply by-passes (removes) the Catalytic converter and maybe open up a little more power as the cat will restrict exhuast gas flow.

generally exhaust systems without a cat will sound raspy

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doh!

got beaten to it! :lol:

NotMyCorsa: Just how easy isit to swap them back and forth on a corsa 1.2 16v? (cat is in the front of the engone bay)

modern exaust systems contain a catalytic converter to reduce emissions.

It is now a legal requirement.

A de-cat pipe simply by-passes (removes) the Catalytic converter and maybe open up a little more power as the cat will restrict exhuast gas flow.

generally exhaust systems without a cat will sound raspy

D'oh....echo...lol

You will need the original CAT come MOT time though...as the car will probably not pass the emissions test without it.

Your exhaust system has a catalytic converter in it to reduce harmful gasses.

However the cat is the most restricive part of the exhaust and you are loosing potential horse power because of it.

If you replqace the cat for a straight through pipe you will gain allot of power.

BUT

Your car will most probably fail its MOT because all cars after a certain year have tougher emmission tests and are required to have a cat fitted.

It replaces the Catalytic Converter. It helps your car breathe better aswell. I have one on the Prelude and it made a BIG difference!

what it one and what does it do????