View Full Version : Complete de-cat........
Well Paul (aka Slow dog) spent most of his evening gutting our front cat out on the NA. We decided to leave it in as there is some flexi piping on the front of it where it bolts onto the manifold, and Paul has had problems before with his Golf where pipes keep breaking, so he cut it open and gutted it out. Well I never actually knew what was inside a cat, but I can now see why you wouldnt want them. The car now does feel a lot free'er (if thats a word ;) ), especially below 4k revs where is always felt a little heavy, or sluggish. Always felt you had to drive her around the 4.5/5k revs. And guess what she's now a little louder to (that'll please the neighbours).
Pulled out of the garage (lucky as I was going to go out sideways ) and was booting it up to 40mph, and a copper drove straight past in teh opposite direction, he turned straight around so I pulled over, and they pulled along side me, I though I cant tell them I have just gutted the cat, so had said it had been of the road and I have just picked her up. They said they didnt mind me putting my foot down, just make sure it was on the dual carriageway, I was like cheers lads. Shame there isnt more like them, as they were truley good sports, after all they could have gone over the car.
Anyway, to NA owners out there, get rid of them, especially the front one.
Oh, and considering it was 10 years old, the cat was still clean.
And again, big thanks to Paul (I'll drop to my knees later for ya :innocent: ) for his work/hours and effort, although I dont think we would really have a choice over his passion for cars anyway.......
Nice one! Bet you thought you were in trouble ;)
Originally posted by Supragal
Nice one! Bet you thought you were in trouble ;)
Erm, well I knew my speedo never went above 40, and they were going in the opposite direction, so I knew they never had anything, but I still wasnt going to get smart with it, and they turned out to be top blokes..... :D
Originally posted by Ashley Willis
Anyway, to NA owners out there, get rid of them, especially the front one.
Getting mine out next week (cats that is) :thumbs:
Have you got a replacement pipe for the front as well.....???
Yep. I'm the proud owner of two CW NA decat pipes :)
Originally posted by Faye
Yep. I'm the proud owner of two CW NA decat pipes :)
How much were they........
Got them off one of the owners on the board for £100, 6 months old. To say I was pleased is an understatement :D
Originally posted by Faye
Got them off one of the owners on the board for £100, 6 months old. To say I was pleased is an understatement :D
DOH I knew that already.......how much are they new frrom CW or just the front one......
For both you are looking at around £300, not sure what the front pipe on its own is though.
Chris Wilson
14-07-04, 10:04
£160, it's a tricky blighter to make as it has a stainless flexi section in it and as you know it has dual pipes.
Is it gonna make much difference taking out just the second cat and still being able to pass the MOT, or do i have to take out both? (PITA having to put it on again every year for the MOT)
It is a PITA, but to be honest I would advise to take them both out, when you look inside one, you will see why. The revs feel like they want to move quicker and earlier........as already said.
Chris Wilson
14-07-04, 10:47
Originally posted by Castle
Is it gonna make much difference taking out just the second cat and still being able to pass the MOT, or do i have to take out both? (PITA having to put it on again every year for the MOT)
You need to remove both cats for a worthwhile gain. Hell, it's only 20 minutes once a year, you spend more time re fuelling than taking the 2nd cat in and out ;)
yes take them both out, Chris did them both for me, feels loads better, and sounds loads better than the tt
SupraStar 3000
14-07-04, 20:31
I'm sure in time I'll also be removing the cat(s). on my NA.
Questions:
Chris, 20 minutes to put the cats back on is very quick.
Whats involved.
Is removing/replacing (for MOT) easier than adding a new backbox to an exhaust?
Can you do the job yourself on jacks/axle stands?
Originally posted by SupraStar 3000
I'm sure in time I'll also be removing the cat(s). on my NA.
Questions:
Chris, 20 minutes to put the cats back on is very quick.
Whats involved.
Is removing/replacing (for MOT) easier than adding a new backbox to an exhaust?
Can you do the job yourself on jacks/axle stands?
20 minutes with a ramp maybe - takes me about an hour, using axle stands. Never get under a car that's only on jacks.
Still easy though.
Chris Wilson
14-07-04, 22:16
£20 quid once a year to an exhaust fitting monkey seems the most sensible option if you don't have access to a ramp. An hour???? Glad you don't work for me mate... :p Just kidding, worked on my back for too long as a youngster, it's soul destroying when you get older and the aches and pains set in. Lying in puddles has taken its toll!
I have taken my cats out aswell and fitted a powerflow one i dont think they fitted a restricter ring would i need to get a FCD or BCC cos im sure it will be running a higher boost also just spoke to someone who adv FCD and BCC is bad for the engine as the car runs more leaner and in time the engine blows
Please help
Imran:confused: :confused:
Originally posted by Chris Wilson
£20 quid once a year to an exhaust fitting monkey seems the most sensible option if you don't have access to a ramp. An hour???? Glad you don't work for me mate... :p Just kidding, worked on my back for too long as a youngster, it's soul destroying when you get older and the aches and pains set in. Lying in puddles has taken its toll!
Indeed - plus when you can only get the front of the car in the air it's pretty fiddly at the back! Admittedly half that hour is spent getting everything ready... ;)
What you want is a Veilside kit and slightly lowered suspension so you have to bugger around driving the car up on bits of wood and bricks so you can *just* get the factory jack under one side....
I was stopped in France once and they searched the car, copper pulled out a brick and a rather long wheel brace from behind the passenger seat. I gave a mock demonstration of changing a flat tyre and managed to convince him I didn't use it to throw through windows and club people around the head....:innocent: :)
dangerous brain
16-07-04, 23:21
Now I have a HKS hyper meant for a TT and as such I was under the impression that if I took my cats out I would knack my engines back pressure and hence my performance??? I allready notice a distinct power shift from my previous even rev range power to more top end. Would taking my cats out really knack my usable power range?
Chris Wilson
16-07-04, 23:40
Originally posted by dangerous brain
Now I have a HKS hyper meant for a TT and as such I was under the impression that if I took my cats out I would knack my engines back pressure and hence my performance??? I allready notice a distinct power shift from my previous even rev range power to more top end. Would taking my cats out really knack my usable power range?
No.
dangerous brain
17-07-04, 00:02
Originally posted by Chris Wilson
No.
So what effect apart from allready setting car alarms off in my street will de-catting my N/A have?
Chris Wilson
17-07-04, 09:42
It will make the exhaust have less back pressure, ie, less restrictive.
dangerous brain
17-07-04, 10:19
Originally posted by Chris Wilson
It will make the exhaust have less back pressure, ie, less restrictive.
But doesn't the engine need that back pressure?? I've been told on many an occasion that it does?
It doesnt need the back presure from the cats, as you can feel it free it up more. What we was contempleting is whether a set of de-cat pipes for the NA, are just pipe replacements, as I was told by someone that if you removed the first cat, then it would loose its back pressure, hence why gutting it would be more benificial.
:confused: :confused:
Hang on a minute Mr Wilson, didn't I ask you over 6 months ago for some HKS gaskets for your de-cat pipes?
Where are they?
Blimey, you wanna spend less time sniping foxes.
About 1/2 hour to 1 hour to jack up and swap over the 2nd cat. Only four bolts to deal with.
If you gutted the cats, wouldn't the now empty chamber have an odd stalling effect on the flow of exhaust gases?
Chris Wilson
18-07-04, 00:53
Originally posted by Rob
Hang on a minute Mr Wilson, didn't I ask you over 6 months ago for some HKS gaskets for your de-cat pipes?
Where are they?
Blimey, you wanna spend less time sniping foxes.
About 1/2 hour to 1 hour to jack up and swap over the 2nd cat. Only four bolts to deal with.
Sorry if I have missed the post? Have you paid for something you haven't received? Sincere apologies if so. Contact me on 07971-952084 on Monday and I'll sort it out.
Originally posted by Rob
If you gutted the cats, wouldn't the now empty chamber have an odd stalling effect on the flow of exhaust gases?
Ours doesnt, but what I do want to know is can you remove the front cat properly without loosing the back pressure.....
Well, I've got no cats and no problems. Felt a slight increase in performance but have got used to it now.
Oh and Chris W. I've not paid for anything but you were going to give me a price for a pair of HKS gaskets for the mid pipe section.:D
Chris Wilson
18-07-04, 23:19
They are about 6 quid each I think, can check tomorrow if you still want some?
Yes please, I'll post you a cheque with address details, £12, and how much for postage?
Chris Wilson
19-07-04, 10:28
Originally posted by Rob
Yes please, I'll post you a cheque with address details, £12, and how much for postage?
PM sent. Thanks.
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