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3CorsaMeal

posted on 1st Jun 04 at 20:26

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


little_foz

posted on 2nd Sep 03 at 15:48

thanx u guys x


Ditch

posted on 2nd Sep 03 at 15:43

quote:
Originally posted by MikeH
quote:
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


Why don't older cars without them sound raspy?


listen to an old XR2 or somethin like that, usually sound pretty raspy to me!


Wolf In Welsh Clothing

posted on 2nd Sep 03 at 15:27

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]


MikeH

posted on 2nd Sep 03 at 15:18

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

Are they just better ones than the originals?


Wolf In Welsh Clothing

posted on 2nd Sep 03 at 15:13

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!


MikeH

posted on 2nd Sep 03 at 15:00

quote:
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


Is that maybe because people remove the centre section as well?

Why don't older cars without them sound raspy?


Ditch

posted on 2nd Sep 03 at 14:59

doh!

got beaten to it! :lol:


MikeH

posted on 2nd Sep 03 at 14:58

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)


Ditch

posted on 2nd Sep 03 at 14:58

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


JoeyB

posted on 2nd Sep 03 at 14:57

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


JoeyB

posted on 2nd Sep 03 at 14:56

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


MikeH

posted on 2nd Sep 03 at 14:56

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.


JoeyB

posted on 2nd Sep 03 at 14:56

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


little_foz

posted on 2nd Sep 03 at 14:53

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