de-cat exhaust system....

1. stormV12 Newbie Joined: Jan 2008 peterborough Posts: 27 saxo 2001 1.4i furio

   #1 6th January 2009, 21:23

   just a few short sharp answers needed here on a de-cat exhaust system
   -what would be the benefits? speed? acceleration??
   -how much for a decent one? ie parts,fitting?
   -would i get my trousers pulled down on insurance as im only 18???
   
   cheers
2. Cole Newbie Joined: Dec 2008 west lothian Posts: 29 saxo vtr,pug 205 turbo

   #2 6th January 2009, 21:28

   alright man, i have a group n system decat on mine, personaly feel it makes a difference!
   can be expensive depents what u want think i paid £150 for the manifold and £260 for center section and back box! haha ure not ment to tell the insurance about decat mate!
3. stormV12 Newbie Joined: Jan 2008 peterborough Posts: 27 saxo 2001 1.4i furio

   #3 6th January 2009, 21:35

   yeh but im a nutter and if i stack it im fucked lol
   mind u.....its no ferrari at 2001,85k on the clock!!
   i suppose u gotta take the risks...
4. stormV12 Newbie Joined: Jan 2008 peterborough Posts: 27 saxo 2001 1.4i furio

   #4 6th January 2009, 21:36

   is there an improvment on sound at all???
   what about fuel economy?? out the window??
5. SaxoJamie Saxperience Forum Bum Joined: Jul 2007 Sussex Posts: 3891 2x 106 GTi

   #5 6th January 2009, 22:28

   decat will
   
   - make it sound alot louder and raspier even on a standard system it sounds louder.
   
   - might be slightly slower off the line due to the loss of low down torque and the power gains are usually more toward the upper end of rev band
   
   - will be a lot more free revving, power gains of 5-10 %
   
   - fuel economy may improve as there is less restriction on the system
6. essexdon Established Member Joined: Apr 2008 Canvey Island Posts: 1625 MY96 Impreza WRX 287bhp/299lbft ;)

   #6 7th January 2009, 23:56

   Hi does anyone know where I can get a decat pipe for vts mk2? Ive already tried the usual ebay etc
   
   thanks very much
7. willsy West Midlands Joined: Nov 2005 Nuneaton (West Mids) Posts: 13835 '64 Volvo V40 R’Design, '89 Ph1 309 GTi, ‘97 Mk1 S

   #7 8th January 2009, 00:01

   Quote:

   Originally Posted by essexdon Hi does anyone know where I can get a decat pipe for vts mk2? Ive already tried the usual ebay etc thanks very much

   supersprint centre section is compatable with a standard/most aftermarket back boxes and manifolds
   
   
   Dont forget that with a decat you WILL NOT pass an MOT. Firstly as its illegal and secondly because emissions will be over the limit
   
   Keep hold of your standard centre section with the cat for MOT time
8. bpm Established Member Joined: Dec 2008 Hemel Hempstead Posts: 1013 Citroen Saxo 16v 1.6 VTS '99 (Pearlescent Blue/Red

   #8 8th January 2009, 00:02

   A decat centre section is a bit of pipe! Any exhaust garage can make you up a piece of pipe of the same diameter to join your manifold to your rear section. It doesnt need to be anything special as it has no sensors, baffles, or anything!
9. baker556 Saxperience Forum Bum Joined: Mar 2007 127.0.0.1 Posts: 4826 oem+ sax

   #9 8th January 2009, 00:19

   Quote:

   Originally Posted by willsy supersprint centre section is compatable with a standard/most aftermarket back boxes and manifolds Dont forget that with a decat you WILL NOT pass an MOT. Firstly as its illegal and secondly because emissions will be over the limit Keep hold of your standard centre section with the cat for MOT time

   it will pass an mot with the decat on if it passes the emissions ! which is possible if the car is treated right ....i quote the haynes !
10. evans1089 Saxperience Post Whore Joined: Jun 2007 Chesterfield Posts: 8935 Ibiza Cupra 204bhp

    #10 8th January 2009, 00:43

    Quote:

    Originally Posted by SaxoJamie decat will - make it sound alot louder and raspier even on a standard system it sounds louder. - might be slightly slower off the line due to the loss of low down torque and the power gains are usually more toward the upper end of rev band - will be a lot more free revving, power gains of 5-10 % - fuel economy may improve as there is less restriction on the system

    - make it sound alot louder and raspier even on a standard system it sounds louder.
    But dont decat a standard system.. no point
    - fuel economy may improve as there is less restriction on the system
    WRONG, de-cating means removing the cat off the manifold.. a cat regulates input of fuel into the engine from the gases given out of the engine, and cleans it a little.
    So... removing the cat normally results in overfueling slightly, so BAD fuel economy...
11. willsy West Midlands Joined: Nov 2005 Nuneaton (West Mids) Posts: 13835 '64 Volvo V40 R’Design, '89 Ph1 309 GTi, ‘97 Mk1 S

    #11 8th January 2009, 00:49

    Quote:

    Originally Posted by baker556 it will pass an mot with the decat on if it passes the emissions ! which is possible if the car is treated right ....i quote the haynes !

    Its very doubtful that it will pass an MOT without a cat unless you happen to know someone 'friendly' thats doing the testing.
    
    You're allowed 0.2% leeway on the emissions. My car (granted its not standard) was over 1.2% over which is quite far - the tested actually used the words catastrophically over the limit.
12. Nick_106 Regular Poster Joined: Apr 2008 Posts: 470 Ford Ranger Pick Up

    #12 8th January 2009, 01:00

    Quote:

    Originally Posted by willsy De-cat is illegal on all cars after 1993 (k reg approx) hence it will not pass MOT

    Theres a grey area over whether you NEED a cat convertor for mot, i asked my local garage if a cat is needed if the car would pass without it and they replied that a cat isnt compulsory but it is if it doesnt pass without one!
13. willsy West Midlands Joined: Nov 2005 Nuneaton (West Mids) Posts: 13835 '64 Volvo V40 R’Design, '89 Ph1 309 GTi, ‘97 Mk1 S

    #13 8th January 2009, 01:27

    Quote:

    Originally Posted by Nick_106 Theres a grey area over whether you NEED a cat convertor for mot, i asked my local garage if a cat is needed if the car would pass without it and they replied that a cat isnt compulsory but it is if it doesnt pass without one!

    Numerous places that i asked said there would be a hope in hells chance of it passing without a cat, they were right since i was well over the limit
14. JamesRm Forum Section Moderator Joined: Aug 2008 Liverpool Posts: 15517 Saxo VTR

    #14 8th January 2009, 08:06

    a decat is illegal on all cars after late 1992, not 1993 willsy.
15. essexdon Established Member Joined: Apr 2008 Canvey Island Posts: 1625 MY96 Impreza WRX 287bhp/299lbft ;)

    #15 16th January 2009, 23:34

    ok thanks guys, nice car willsy in performance french car looks awesome
16. AlexBp West Midlands Joined: Dec 2007 West mids Posts: 23149 Supra,civic GL

    #16 16th January 2009, 23:50

    Quote:

    Originally Posted by bpm A decat centre section is a bit of pipe! Any exhaust garage can make you up a piece of pipe of the same diameter to join your manifold to your rear section. It doesnt need to be anything special as it has no sensors, baffles, or anything!

    apart from the after cat lamda sansor is in there on later cars
    
    plus it has to kink to avoid the arb and will nee to be smooth bend with no pinching
    
    unless said garage has a mandrel bender in which case yes they could make one up
17. Mint-VTR Established Member Joined: Mar 2008 Sawbridgeworth Posts: 1883 Black VTR, Clio 172. Gaz Coilovers, Stealth Exhaus

    #17 17th January 2009, 17:01

    i say your best of keeping the cat in your vtr, although the noise changes alot without a cat
18. craigy1989 Newbie Joined: Jan 2009 Posts: 29 saxo vts

    #18 19th January 2009, 13:20

    Quote:

    Originally Posted by stormV12 yeh but im a nutter and if i stack it im fucked lol mind u.....its no ferrari at 2001,85k on the clock!! i suppose u gotta take the risks...

    a decat car is illegal, thats why you have to put it back in for the mots i think its to do with the emissions, but makes the car sound better, and couple of my mates have it done n there car when revved high under load spit flames and thats on a 1.2 corsa and on a vtr