Gutting a ph2 cat conv

1. user_51949 Infrequent Poster Joined: Apr 2011 Bournemouth Posts: 108 Saxo VTR

   #1 2nd November 2011, 16:40

   I have seen someone on here who has gutted a standard ph2 (in manifold) cat and retained the cast iron manifold. Would this give an increase in power or just a shed load of noise?
   As im toying with getting a cat from a scrap saxo for an experiment.
2. mlawlan69 Saxperience Forum Bum Joined: Sep 2010 leeds Posts: 4389 MCS R53 S/C 16v furiooo

   #2 2nd November 2011, 16:40

   both i dare say.
   
   cheap decat lol.
3. user_51949 Infrequent Poster Joined: Apr 2011 Bournemouth Posts: 108 Saxo VTR

   #3 2nd November 2011, 16:41

   Im aware that the cast iron manifold in still restrictive, just looking at an experiment more than anything else?
4. mlawlan69 Saxperience Forum Bum Joined: Sep 2010 leeds Posts: 4389 MCS R53 S/C 16v furiooo

   #4 2nd November 2011, 16:42

   well, what kind of experiment?
5. user_51949 Infrequent Poster Joined: Apr 2011 Bournemouth Posts: 108 Saxo VTR

   #5 2nd November 2011, 16:46

   to see if it gives any gains?
6. saxovtrmk1 Regular Poster Joined: Jun 2011 Wakefield Posts: 395 saxo vtr/vts 106 diesel

   #6 2nd November 2011, 19:51

   i nocked my cat out on my 106 quicksilver few years ago did make a little power gain and more noise just ran terrible on cold mornings till it was warm and drank more fuel lol defo felt a slight improvment was it worth it? nah lol
7. user_27808 Established Member Joined: Oct 2008 west london Posts: 1150 rx8 (vag 1.8t project) civic type r (ep3)

   #7 6th November 2011, 07:23

   just buy a mk1 manifold and downpipe as it will cost the same and you'll have a decat my friend
8. xsi16v Regular Poster Joined: Jan 2006 Ilkeston, Derbyshire Posts: 469 374 bhp Supercharged 205 GTI, Passat Estate

   #8 8th November 2011, 22:57

   as said above, cheapest way to de-cat a mk2. Just be aware that it does come close to the plastic oil filter so i'd advise heat wrap or some king of heat shield on the filter.
9. user_57844 Infrequent Poster Joined: Mar 2012 llanharan Posts: 178 saxo furio c2 gt conversion

   #9 15th August 2012, 21:57

   you could always drop the oil filter and have a metal screw in one only problem is it involves drilling and tapping the block ,
   
   but also a ph1 mani is shorter than a ph2 mani underneath were it connectes to the middle pipe on the exhaust
10. Monksbridge Newbie Joined: Aug 2012 Posts: 1

    #10 15th August 2012, 22:16

    Knocking the middle out of ur cat will increase bhp, noticeable particularly in the mid range when overtaking etc. it will alter the noise too and on some vehicles it can create that awful rasping sound, others it's like music, depends on the exhaust design! Also bear in mind you will have to put your original back on when it's MOT time!
    
    Hth
    Craig