DJ Compassion
Member
Registered: 17th Jun 04
Location: shropshire
User status: Offline
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just had a custom exhaust made for my corsa sport...
i got a peice of lightweith flex pipe fitted it to the down pipe, then it goes through a cat (which is completly empty :thumbs , then the pipe goes straight to the rear scorpion back box.
sounds sweet as a nut, real deep bass sound, but when it gets to 3000 revs it gets raspy, my mate reved it and i went down under for a looky, it sounded like it was coming from the backbox where the pipe it fixted to it or just inside the box. anyone know what this could be, its not a bad thing at all it actually sounds quite nice but id like to know whats causing it.
i will take some pics of it tomorrow
gaz
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blundey
Member
Registered: 25th May 04
Location: Flitwick, Bedfordshire
User status: Offline
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welded?
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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why the empty cat???
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Corsa^Dan
Member
Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
User status: Offline
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so i theory it has 1 :/ sorta
itll still fail emmisions tho
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kortas
Member
Registered: 21st May 03
Location: Stockport
User status: Offline
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so if the police go under they see the cat they leave u alone, but for mot your still going to need an ACTUAL cat, personaly i dont see any advantage of removing it on anything lower than a 1.6
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Kris TD
Member
Registered: 25th Mar 02
Location: Ware, Hertfordshire
User status: Offline
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removing the cat is renound for making it sound raspy.
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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removing the cat by bashing the inside out will make the exhaust flow really shit and therefore you shalll loose performance
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kortas
Member
Registered: 21st May 03
Location: Stockport
User status: Offline
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best fake cat ive seen so far, is a straight through exhaust with half a cat spot welded onto the exhaust, thought it was quite comical 
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MoNkEy MaGiC
Member
Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
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quote:
Originally posted by DJ Compassion
just had a custom exhaust made for my corsa sport...
i got a peice of lightweith flex pipe fitted it to the down pipe, then it goes through a cat (which is completly empty :thumbs, then the pipe goes straight to the rear scorpion back box.
sounds sweet as a nut, real deep bass sound, but when it gets to 3000 revs it gets raspy, my mate reved it and i went down under for a looky, it sounded like it was coming from the backbox where the pipe it fixted to it or just inside the box. anyone know what this could be, its not a bad thing at all it actually sounds quite nice but id like to know whats causing it.
i will take some pics of it tomorrow
gaz
i would like to see the pics mate as im getting a very similar system to yours on my 1.6 16v Gsi, i got a scorpion back box at the moment and want a full thru system to make it louder.
i guess one way to avoid the police doing you for no cat is to lower your car Very low like 70mm! then they wont even be able to look under it! 
well if the raspyness sounds good then i guess its ok, but its probably coz you got no cat, but if you say its from the backbox it could be a dodgy weild/connection!
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mentalasanything
Member
Registered: 27th Jan 04
Location: Hengoed Drives:Corsa Sport
User status: Offline
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I got a stainless steel cat back exhaust and de-cat pipe and mine sounds a bit raspy when accellerating hard-ish, sounds bloody good all other times too. I found that after a long journey (80miles+) the raspyness practically dissapears and is only on v hard accell. Dnt bother me too much tho as you hardly hear it outside, my sound comes from cat area tho
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ado
Member
Registered: 19th Oct 03
Location: Chesterfield,midlands
User status: Offline
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an how often do ya get the police lookin under ya car? Like never!!!
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DJ Compassion
Member
Registered: 17th Jun 04
Location: shropshire
User status: Offline
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yeah ive found out for sure, its the cat removal that makes the raspyness, its not a bad thing, in fact it sounds great, and as for loosing performance, lol. i thnk not, lets put it this way theres a road at the back on my house and i used to get to about 74mph on it before i had to break, the day i had it done i got about 88mph on it.
cats restrict your power, therefore removing one gives you a bit more.
as for mots, simple... jus undo one clamp and put old exuast system back on, no failed mots 
my mate saw a flame come out as well today whilst i was showing him it, lmao
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MoNkEy MaGiC
Member
Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
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so it is the cat that causes the raspyness
well as long as it dont sound farty/backfiring!
would their be more rasp on a 1.6 16v engine in comparison to a 1.4 16v???
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C18RSA
Member
Registered: 25th Feb 01
Location: dunstable / luton
User status: Offline
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I had that problem,
firstly i HAD A SCORPION imola backbox with straight through 2.5 inch pipe and the scorpion de cat pipe which actually looks similar to a cat itself.
sounded okay.
I then decided to remove the middle box to give me a deeper tone. That sounded awesome until my baffles broke in my back box.
I got a single custom 5inch slash stainless steel box and then the raspyness arrived. didnt sound too bad but u couldnt here urself think inside the car.
I have now had a mitsibusi evolution centre box fitted to my system and another 5inch slash stainless box fitted the other side and christ it sounds fookin awesome.
I have
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ed
Member
Registered: 10th Sep 03
User status: Offline
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You need to have a silencer instead of an empty CAT.
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