VTR exhaust

1. KatieW81 L-plater Joined: Feb 2012 Hull Posts: 40 Saxo 1.6 VTR

   #1 6th February 2012, 12:31

   i have a mk2 vtr and it has a performance back box on it, i recently replaced the cat as it had gone, i have a K&N on it but the exhaust is really quiet! if i put a staight thru on it will improve sound? or should i have not replaced the cat? its due for mot in april and thought a de-cat pipe would make it fail...any input on improving the sound muchly appreciated!
2. Swify L-plater Joined: Feb 2012 London Posts: 57 Saxo VTS RENAULT 5GT

   #2 6th February 2012, 12:54

   Taking the Cat out will improver the sound and the pull, but you will want to keep that Cat to get it through the MOT, i know alot of people that use a ...... Sleave...., remove cat place in sleave use for 11 months and 30 days then replace Cat for MOT, then place in sleave when you get home.... unless you know an MOT station... A little bit of flirting can sometimes help
3. mcjacko1987 Established Member Joined: Feb 2011 Rochdale Posts: 1896 mk2 saxo 1.4 furio in possi blue

   #3 6th February 2012, 12:59

   doesnt the mk2 have the cat in the downpipe? so would mean swapping that for mot time.
   got 2 months until mot anyways so get it decatted and keep your cat, just put it on for mot.
4. Swify L-plater Joined: Feb 2012 London Posts: 57 Saxo VTS RENAULT 5GT

   #4 6th February 2012, 13:14

   If its on the down pipe would`nt it pay to get a 4branch, although a pain in the ass changing that once a year
5. mcjacko1987 Established Member Joined: Feb 2011 Rochdale Posts: 1896 mk2 saxo 1.4 furio in possi blue

   #5 6th February 2012, 13:19

   yeah will be a 4branch needed to decat mk2. what you could do is get a 4 branch and then get a mk1 centre section with underfloor cat when mot comes, be easier to change than mani every year lol
6. KatieW81 L-plater Joined: Feb 2012 Hull Posts: 40 Saxo 1.6 VTR

   #6 6th February 2012, 14:06

   this is a real girlie reply so i do apologise in advance
   
   downpipe? under floor cat? i did look when the cat was getting fitted it looked like underfloor to me!
   
   i was considering getting a 4branch and decat pipe someone had suggested just changing middle to straight thru but said that id need a need back box so it would fit...i thought u could have any back box?
   
   the garage i use is great, hes a ford specialist tho, it where i used to take fiesta zetec-s, but a low cut top and batting the eyelashes work wonders!
7. mcjacko1987 Established Member Joined: Feb 2011 Rochdale Posts: 1896 mk2 saxo 1.4 furio in possi blue

   #7 6th February 2012, 14:11

   if its under the floor cat then yeah de-cat it and then when its mot time re-fit the cat, easy enough job to do. and in theory you can make any back box fit if you know a good welder or get a good exhaust garage to fit.
   but best off getting a saxo fitment one as can effect performance. i have a universal one which i will soon be getting rid of but its been welded to fit. the bore on that backbox is different size than standard saxo middle pipe so has to me made to fit lol.
8. KatieW81 L-plater Joined: Feb 2012 Hull Posts: 40 Saxo 1.6 VTR

   #8 6th February 2012, 14:22

   what back box would u suggest to get? or is it just personal taste? i dont want it to look huge, but want a good sound if that makes sense
9. mcjacko1987 Established Member Joined: Feb 2011 Rochdale Posts: 1896 mk2 saxo 1.4 furio in possi blue

   #9 6th February 2012, 14:24

   think most on here go supersprint. but it is personal taste. get on ebay search saxo back box and look around. most have a decent tone anyway, but if its too quiet get the car de-catted, will make it louder, if still to quiet get the centre silencer removed if it has one, if not then 4-2-1 manifold. but as i said most have a good tone to them anyways

   1 user thanked this post: KatieW81
10. KatieW81 L-plater Joined: Feb 2012 Hull Posts: 40 Saxo 1.6 VTR

    #10 6th February 2012, 14:44

    right will have a look! thanks again for ya help
11. Wee_monkey1987 Regular Poster Joined: Sep 2011 Hertfordshire Posts: 250 2000 Saxo Woodland Green VTS, 2002 Mazda MX5

    #11 6th February 2012, 15:29

    Cat on a VTR mk2 is located directly after the four-1 branch on the exhaust, remove the heat shield (pic 1) and you'll see one of these (pic 2)
    
    (pic 1) http://www.ebay.co.uk/itm/Citroen-sa...item3f131ba80d
    
    (pic 2) http://www.ebay.co.uk/itm/Citroen-Sa...item4ab31676a9
    
    Before removing the heat shield you'll see a wire directly in the middle of the heat shield, this is lambda bank 1, this reads emissions before the cat giving the engine management system (EMS/ECU) its short trim data for emissions, if you look to the right hand side between the battery and manifold you'll see another wire connected to another lambda sensor within the exhaust downpipe this is bank 2 - designed to read emissions output after the cat, this gives a long trim for the ECU emissions
    
    Between these two points/sensors lies the cat, as soon as you put on a new 4-2-1 you eliminate the cat on mk2 VTRs. thus reducing backpressure giving more pull as Swify quoted
    
    The reason the cat is situated so close to the exhaust valves is to improve cat lightoff!
    
    Cat lightoff: - the boring science part
    
    All cats operate above 350-400deg.C, obviously when you start the car on a day like today it takes some minutes for the exhaust gases to heat the cat to 400deg.C thus the closer the cat to the exhaust valves the shorter its light off time! aka operating temperature time.
    
    Hope this explain abit more in detail for you

    2 users thanked this post: mcjacko1987, KatieW81
12. KatieW81 L-plater Joined: Feb 2012 Hull Posts: 40 Saxo 1.6 VTR

    #12 6th February 2012, 15:44

    Thats great thank you! i need one of you lot to live near me lol having to do it yaself is a pain in the arse, most garages round here wont touch saxo's for some reason ? ill track someone down locally...i know what i want but i will not break a nail doing it myself :-P
13. KatieW81 L-plater Joined: Feb 2012 Hull Posts: 40 Saxo 1.6 VTR

    #13 9th February 2012, 17:59

    off to rebel powerpipes at the end of the month they gonna do stainless steel from cat back for me so pics and vids will be just after that..when i work out how to upload them lol thanks again for all the info!
14. mcjacko1987 Established Member Joined: Feb 2011 Rochdale Posts: 1896 mk2 saxo 1.4 furio in possi blue

    #14 9th February 2012, 20:16

    Quote:

    Originally Posted by KatieW81 off to rebel powerpipes at the end of the month they gonna do stainless steel from cat back for me so pics and vids will be just after that..when i work out how to upload them lol thanks again for all the info!

    nice
    look forward to seeing the vids