ToDe-cat or not to De-cat that is the question?

1. stormin Established Member Joined: Jun 2007 Toronto, Canada Posts: 1118 Mitsi Evo 2008

   #1 21st August 2008, 14:00

   Need a direct answer.
   
   Got a supersprint mani and full magnex cat back system need to know what if any dif it will make de-catting this set up?
   
   and dont say use the search button done that and it varies so much it gets confusing so it is easy yes or know and a little of why.
   
   Pretty urgent as car booked in for tomorrow
   
   cheers
2. Davidp Saxperience Addict Joined: May 2006 Posts: 12553

   #2 21st August 2008, 14:02

   Basically, Decatting with give you a few extra ponies mate and make it abit louder
3. fossie Saxperience Forum Bum Joined: Oct 2004 Spennymoor, United Kingdom (England) Posts: 3742 Saxo MK2 VTS

   #3 21st August 2008, 14:03

   De-cat it....
   Reason; Cause you have to, simple
4. Ferg Saxperience Forum Bum Joined: Jun 2007 Maidstone, Kent Posts: 4928 Clio 197 Cup

   #4 21st August 2008, 14:08

   Yeah get it done ...
5. RCD-Performance Established Member Joined: Dec 2007 Southampton Posts: 2278

   #5 21st August 2008, 14:12

   Decatting any car makes a difference.
   
   to be fair.....theres no reason not too except the fact its illegal obviously
6. VTS_Gaz Frequent Poster Joined: May 2008 Motherwell Posts: 533 Pug 306 Gti6

   #6 21st August 2008, 14:29

   What about the loss of back pressure causing mid range torque to drop slightly?
7. makaveli144 Saxperience Forum Bum Joined: Feb 2007 Burton Posts: 3661 Alfa Romeo GT

   #7 21st August 2008, 14:32

   Quote:

   What about the loss of back pressure causing mid range torque to drop slightly?

   Get a BTB.
8. Yates Saxperience Hardcore! Joined: Mar 2005 Pompey/Darlo Posts: 31546 MK1 - 1.1 Animal

   #8 21st August 2008, 14:34

   the car with the decat should feel more responsive, defo worth doing
   
   btbs rock
9. Mark51p Super Moderator Joined: Sep 2006 Wakefield Posts: 14427 Golf GT

   #9 21st August 2008, 14:44

   Quote:

   Originally Posted by Yates btbs rock

   yours rocked the whole street
10. nazz1 Established Member Joined: Aug 2007 South Wales Posts: 2076 Saxoless

    #10 21st August 2008, 16:15

    definitely more responsive
    
    you should de-cat it even if it's just to try it, it's so easy to change
11. DJjuveVTS Regular Poster Joined: Jun 2008 Dundee Posts: 298 106 GTI

    #11 21st August 2008, 16:37

    whats a btb? lol
12. nazz1 Established Member Joined: Aug 2007 South Wales Posts: 2076 Saxoless

    #12 21st August 2008, 17:42

    not sure what it stands for
    
    http://www.btbexhausts.co.uk/
13. Yates Saxperience Hardcore! Joined: Mar 2005 Pompey/Darlo Posts: 31546 MK1 - 1.1 Animal

    #13 21st August 2008, 17:45

    back to best i was told, something along those lines
    
    it rocks my whole house, but the sound of it, mmmmmmm
14. user_18031 Established Member Joined: Sep 2007 Co.Durham Posts: 1679 2 clio 182's and Icelandic Vtr

    #14 21st August 2008, 18:12

    go for the de-cat, make sure you can interchange it for the MOT so you can put the cat in so it passes emissions
15. Sophia_Bush Saxperience Post Whore Joined: Jan 2007 Shropshire Posts: 9994 Moonstone Blue 106 GTi

    #15 21st August 2008, 18:37

    probably get some mroe response out of it to, but other than that what the lads have already said bit more power bit more noise
16. hudson701 Regular Poster Joined: Jul 2008 Port Talbot Posts: 279 Citroen Saxo VTS MK2. Lotus Elise Series 2

    #16 21st August 2008, 21:46

    De-catting is illegal if the car is going to be used on road, as it will fail emissions. Also if you crash it, it is unlikely insurance will pay out as the car is not road-legal, so you'd be fucked.
    
    Its also a real pain in the arse swapping it over with the cat come MOT time.
    
    Not really worth it IMO for just a bit of noise and a few extra hp
    
    If you just want the extra noise I suggest a nice loud chavy exhaust and a sports cat for the popping/burbling.
17. user_14757 Established Member Joined: Mar 2007 Middlesbrough Posts: 1186 mazda 3 mps

    #17 22nd August 2008, 00:54

    i thought instantly to btb... back to bed, mayby that should be me
18. Evolution4589 Established Member Joined: Jul 2008 Havant (near Portsmouth) Posts: 1098 Peugeot 206 1.1 LX

    #18 22nd August 2008, 01:05

    You could try a sports cat. The standard ones are about 400 cell, or similar. Try something that's 100-200 cell. Powerflow make sports cats... don't know how legal they are.
19. grant_evans Frequent Poster Joined: Jul 2008 Posts: 863

    #19 22nd August 2008, 02:05

    im not certain but i didnt think it was law that you have got to have a cat as some cars dont need them to pass emisions tests?
20. craigy_87 Saxperience Post Whore Joined: Apr 2006 Wishaw United Kingdom (Scotland) Posts: 7326 Nissan 350z

    #20 22nd August 2008, 02:20

    i say decat it, if you dont like it whack the cat back in
21. djrem Saxperience Addict Joined: Feb 2007 Ramsden Bellhouse (Billericay) Posts: 12826 Various.

    #21 22nd August 2008, 03:42

    Not worth De-catting.
    
    the power you receive, you can spend a little mor eand have a car that has a valid MOT and insurance certificate.
    
    Plus who's going to be pulled to one side?
    
    A quiet sleeper car or a saxo with a rocket sticking out the back roaring along?
22. stormin Established Member Joined: Jun 2007 Toronto, Canada Posts: 1118 Mitsi Evo 2008

    #22 22nd August 2008, 10:10

    Well decided car getting de-cat fitted today and if it rubbish will take it of again and flog it only loss will be the fitting charge so no issue.
    Had a go in a vts last night that is de-catted and alot more responsive than mine and that made my mind up cheers gaz-vts for that.
    Will repor back once i pick the car up cheers for your help.
23. stormin Established Member Joined: Jun 2007 Toronto, Canada Posts: 1118 Mitsi Evo 2008

    #23 23rd August 2008, 12:02

    Early reports suggest that i was right to de-cat the car. And not to much of a change in noise just has a little more rasp.
    
    Alot more responsive throught the rev range and has a little bit more kick in it.
    
    if anyone wants to know my set up is-
    
    supersprint manifold, custom de-cat, full magnex system cat back.
24. Evolution4589 Established Member Joined: Jul 2008 Havant (near Portsmouth) Posts: 1098 Peugeot 206 1.1 LX

    #24 24th August 2008, 14:14

    You forgot to add 'MOT fail' to that list.
25. stormin Established Member Joined: Jun 2007 Toronto, Canada Posts: 1118 Mitsi Evo 2008

    #25 24th August 2008, 19:19

    That why it a custom de-cat interchangeable for ease when MOT due!
    Who cares until MOT due then will sort it so " AM I BOVERED"
26. Ferg Saxperience Forum Bum Joined: Jun 2007 Maidstone, Kent Posts: 4928 Clio 197 Cup

    #26 24th August 2008, 19:25

    Good job man ...
    
    I notice better fuel economy with my de-cat as well ...
27. stormin Established Member Joined: Jun 2007 Toronto, Canada Posts: 1118 Mitsi Evo 2008

    #27 24th August 2008, 19:27

    I did not want to say anything incase i was seeing things but have noticed that i do get slightly more miles to the gallon than norm.
    Thought it was just me.
28. makaveli144 Saxperience Forum Bum Joined: Feb 2007 Burton Posts: 3661 Alfa Romeo GT

    #28 24th August 2008, 19:50

    some MOT places won't fail a decat if it still passes emissions.
    
    I decatted my VTR, it does make them feel a lot better more responsive but less pull from the off. When I changed mine for the mot I could definately feel the difference.
29. adam19 Saxperience Forum Bum Joined: Jun 2008 Harlow, essex Posts: 2731 Clio 182

    #29 24th August 2008, 20:08

    i just stuck a de-cat on mine and wouldnt evan think of changing it back - only time wil be is when its due for an mot
30. CoolC Established Member Joined: Oct 2007 Swindon Posts: 1569 Jap Import Supra 3.0TT 430bhp 6sp

    #30 24th August 2008, 23:22

    As a few have said, i wouldn't de-cat mine as i dont race it and id rarther stay legal. If your going to be wacking it round a track then fair play, do it. If not though, i really dont see the point..
31. stormin Established Member Joined: Jun 2007 Toronto, Canada Posts: 1118 Mitsi Evo 2008

    #31 25th August 2008, 13:51

    Dont really see what dif it makes really for all the time it takes to change it over.
    Have had many people say that it lacks in performance on there VTR but must say no lack of performance in the VTS if anything it has made a huge dif to the take off speed and my top end abillity, dif shots through the rev range more freely than before and alot more responsive and fun to drive.
    In all i would say that i dont mind the maybe 30 mins swaping it over for MOT time as it has def been a worthy purchase.
32. CoolC Established Member Joined: Oct 2007 Swindon Posts: 1569 Jap Import Supra 3.0TT 430bhp 6sp

    #32 25th August 2008, 14:08

    So what do you do if police do a roadside emissions test?
33. stormin Established Member Joined: Jun 2007 Toronto, Canada Posts: 1118 Mitsi Evo 2008

    #33 25th August 2008, 16:29

    Dont drive like a fanny and you will never have to find out!!!
    Not been pulled by the police yet and as long as your exhaust not too loud which mine isn't and you not acting like a fud by answering them back you should be ok.
    90 percent of the time they just have a quick look over your car.
    But to put your mind at rest will have an emissions test done at ma mates garage tomorrow tell you what happens.
34. Mysticp Scotland Joined: Jul 2005 Edinburgh Posts: 9556 Saxo 1.6i 16v VTS, 2 Classic Minis

    #34 25th August 2008, 16:59

    Quote:

    Originally Posted by mottester.co.uk EMISSIONS WITHOUT CAT The MOT regulations say nothing about a vehicle having a catalytic converter. They merely set emission levels which have to be achieved ...

    Source: http://www.motester.co.uk/qanda.html
    
    The police dont regularly carry emissions test kits with them so its only VOSA checkpoints you would need to worry about, if you failed their emissions test they might fine you but probably just issue you a ticket to have your cat converter replaced and an MOT retest.
    
    As the cat converter is in different places on different cars, i.e. in the downpipe, under the car etc its dificult to tell if a car has a cat or not any way.
    
    If you have a horrendously loud exhaust you might draw more attention to yourself and force them to scrutinise the car further.
    
    Never realised some people have such bizarre views on decatting.
35. stormin Established Member Joined: Jun 2007 Toronto, Canada Posts: 1118 Mitsi Evo 2008

    #35 27th August 2008, 12:54

    Well had the car tested yesterday and passed its emisions test but only just and no more but hey it still passed.
    Was told that it depends on the car on the day when being tested, could prob fail today if re-tested but goes to show how close he paramiters really are with or without a CAT.