To decat or not to decat?

1. user_3656 Saxperience Addict Joined: Aug 2004 Herts. N/W London Posts: 13578 Project MK4 MoreDoor

   #1 20th March 2009, 08:34

   Thinking of decatting the car today. not that I've got a cat currently anyway as literally ALL the cat insides are no more.
   Is it really worth it and also will I notice a big difference in fuel consumption?
   The car seems to have a bit of a lumpy idle and decelerating currently makes the car go a bit jerky sometimes, but I'm assuming this is the dodgy cat causing this?
   
   Any help appreciated.
   
   Thanks.
2. Slammed_Posi_Vtr Saxperience Forum Bum Joined: Nov 2006 Royal Tunbridge Wells y0 Posts: 2602 Icelandic VTR

   #2 20th March 2009, 08:43

   Just do it you fanny!
   
   Dont worry about mpg, the difference is minimal, but the extra responsiveness is maximal!
   
   One of the best mods you can make imo, sounds like some sort of fuelling problem you have rather than the cat?
3. JamesRm Forum Section Moderator Joined: Aug 2008 Liverpool Posts: 15517 Saxo VTR

   #3 20th March 2009, 08:48

   If you can live with slightly more noise, slightly less MPG and changing it over for the MOT, then go for it. You should feel an increase
4. user_3656 Saxperience Addict Joined: Aug 2004 Herts. N/W London Posts: 13578 Project MK4 MoreDoor

   #4 20th March 2009, 08:53

   lol. I'm not sure its probably the poor quality air filter not doing it any favoures either.
   Yeh think I'll do it today. Wouldn't mind abit more grunt from the system
5. JamesRm Forum Section Moderator Joined: Aug 2008 Liverpool Posts: 15517 Saxo VTR

   #5 20th March 2009, 08:55

   Yeah you will definetly feel a difference after you decat
6. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #6 20th March 2009, 08:55

   Wouldn't bother really.
7. Slammed_Posi_Vtr Saxperience Forum Bum Joined: Nov 2006 Royal Tunbridge Wells y0 Posts: 2602 Icelandic VTR

   #7 20th March 2009, 09:07

   Its not just the extra grunt you feel, its the fact you feel a lot more in touch with the car, whenever i put mine back on for MOT's, the car just doesn't feel like its running at its potential, its like its being tamed by something, which it is!
8. Sean_VTSp Saxperience Post Whore Joined: Nov 2008 Southend-on-sea Posts: 5149 BMW 325ci ACS3, Mercedes Benz CLK.

   #8 20th March 2009, 09:13

   yea definatly get rid of the cat mate, always try and get a dodgy mot lol but on a serious note like said above it makes a big difference and the car overall just feels better to drive!
9. user_11402 Established Member Joined: Aug 2006 Bristol Posts: 2015 MK2 VTS

   #9 20th March 2009, 09:15

   if im honest i felt little to no difference in responsiveness when i decatted my car. however it is now louder and worse on petrol which is ftl
10. river Infrequent Poster Joined: Mar 2009 Posts: 180

    #10 20th March 2009, 09:19

    Probably a silly question but if you do this do you have to tell the insurance people? Surely if it wouldn't pass an MOT they wouldn't pay out if you had a smash?
11. user_11402 Established Member Joined: Aug 2006 Bristol Posts: 2015 MK2 VTS

    #11 20th March 2009, 09:35

    Quote:

    Originally Posted by river Probably a silly question but if you do this do you have to tell the insurance people? Surely if it wouldn't pass an MOT they wouldn't pay out if you had a smash?

    your 'supposed' to tell your insurance company about EVERY modification to the car mate...(except a select few companies for cosmetic mods etc)
    
    if they wanted to be picky in the even of a claim they probably avoid paying out
12. user_15516 Saxperience Post Whore Joined: Apr 2007 Posts: 6640 Integra DC5R & VTS

    #12 20th March 2009, 09:42

    Why do people say MPG is worse? I didn't find that at all - if anything, it's better on fuel than before.
13. WestC4oasty Regular Poster Joined: Dec 2008 St.Albans Posts: 449 Saxo westcoast Vtr Powered

    #13 20th March 2009, 09:55

    Just do it!!
14. user_3656 Saxperience Addict Joined: Aug 2004 Herts. N/W London Posts: 13578 Project MK4 MoreDoor

    #14 20th March 2009, 11:28

    going to get it done today. Westcoasty, you should pop into Rtec and see me as your only in StA
15. paxo89 Frequent Poster Joined: Dec 2007 Watford Posts: 590 Boosted 16v VTR

    #15 20th March 2009, 11:33

    you work in Rtec??
16. user_3656 Saxperience Addict Joined: Aug 2004 Herts. N/W London Posts: 13578 Project MK4 MoreDoor

    #16 20th March 2009, 11:52

    sure do mate
17. TU-Tuning Saxperience Hardcore! Joined: May 2006 Bristol Posts: 16575 JP4urio, 306 DTurbo SportShed

    #17 20th March 2009, 11:55

    I found I lost low end torque but its meatier higher up the rev range. Worth it imo as mines tripped so I dont need that torque so much low down
18. Robn1987 L-plater Joined: Oct 2008 Ipswich Suffolk Posts: 36 1999 Citroen Saxo VTS 1999 VW Golf GTI 2002 Hond

    #18 21st March 2009, 11:31

    do it, i have manifold straight through and back on my vts and its definately worth it, not sure about the noise you'll as mine has no carpets or sound proofing, so its loud as hell!
19. davidharvey Established Member Joined: Aug 2008 Mull of Kintyre Posts: 1496 Saxo VTR. Pug 407. trabant...seriously VW T25

    #19 21st March 2009, 12:02

    What about a sports cat as a compromise.
    Anyone have any experience of them?
20. TU-Tuning Saxperience Hardcore! Joined: May 2006 Bristol Posts: 16575 JP4urio, 306 DTurbo SportShed

    #20 21st March 2009, 12:27

    Just a waste of money mate, Mario on here had one on his westy, cost hhim a fair bit but he failed is MOT with it
21. Steve Saxperience Hardcore! Joined: Mar 2005 Newcastle Upon Tyne Posts: 19910 CW Honda Integra DC5

    #21 21st March 2009, 12:28

    Quote:

    Originally Posted by LeeumH Why do people say MPG is worse? I didn't find that at all - if anything, it's better on fuel than before.

    because you floor it more to hear the noise, if diving economically, there is a site somewhere that proved mpg did increase.
22. 666 Established Member Joined: Dec 2008 east london Posts: 2219 62 fiesta tdci

    #22 21st March 2009, 12:50

    tbh i got rid of my decat, other than slite better sound i didnt notice any diffrence
23. vts-luke Established Member Joined: Dec 2008 North Posts: 1206

    #23 21st March 2009, 13:54

    de-cat ftw
    pop bang pow
24. GoGs_MacAulay Frequent Poster Joined: Jan 2009 Angus Posts: 668 02 Saxo Vts

    #24 21st March 2009, 19:37

    i would say no got this on my 53 plate vtr and dont really feel the diffo but i'v only got 8 valves
    
    
    
    
25. Hpi_matrix Established Member Joined: Feb 2009 Hertford/Derby Posts: 1272 MG BGT, AX Gti

    #25 22nd March 2009, 01:28

    Go for it
26. user_28622 Established Member Joined: Nov 2008 West Sussex, Worthing Posts: 1671 Golf TDI 130

    #26 22nd March 2009, 10:24

    i did notice it felt alot sharper when you put your foot down, but the sound is quite nice, specailly when it rumbles when the revs come back down
27. Andy72 Frequent Poster Joined: Oct 2007 Newcastle Posts: 825 306 GTI-6

    #27 22nd March 2009, 10:41

    mine feels a little quicker, definetly notice it but that may just be in my head. It has made a difference to the way the supersprint sounds though. Now much more raspier and poppy.
28. jware92 Frequent Poster Joined: Feb 2009 Colwyn Bay/Southend Posts: 608 Mk2 vts VXR engined astra

    #28 22nd March 2009, 10:43

    im wanting to do this.
    just wondering where to get one from and how much?
    ive gt a mk2 vtr with mk1 exhaust setp on it with the cat underneath car
29. user_3656 Saxperience Addict Joined: Aug 2004 Herts. N/W London Posts: 13578 Project MK4 MoreDoor

    #29 22nd March 2009, 17:04

    Well, I went for it. My system sounds superb now.
    Really really pleased with it. Really pops and burbles alot especially when cold.
    Will keep an eye on the mpg though. lol
30. user_28622 Established Member Joined: Nov 2008 West Sussex, Worthing Posts: 1671 Golf TDI 130

    #30 22nd March 2009, 17:05

    sounds alot better dont it
31. gouldy87 Saxperience Forum Bum Joined: Jun 2008 Posts: 3932

    #31 22nd March 2009, 17:09

    if you just change one part of the exhaust at once you dont really tend to notice the gains as much. if you de cat your car it will feel more responsive but when i did mine i never noticed an increase in fuel consumption or anything like that. it pulled alot better lower down the rev range though
32. user_3656 Saxperience Addict Joined: Aug 2004 Herts. N/W London Posts: 13578 Project MK4 MoreDoor

    #32 22nd March 2009, 17:12

    Well, I had decated all of my other saxos bar one, but never a VTS before. But I'm impressed yes!