Homebrew De-cat

1. FunkyDave Infrequent Poster Joined: Jun 2010 Preston, Lancashire Posts: 235 2001 Renault Megane 1.9DTi

   #1 24th June 2010, 16:59

   Looking to make my own de-cat system up. I'm thinkin bout goin down the local scrappers(again) gettin 2 knackered centre sections then cutting the cat out of one and a similar size striaght section out of the other an welding them together. Am I right in thinking that i can mig them together or would i need to tig them?
2. ryanmt Established Member Joined: Oct 2004 Warrington Posts: 1987 AX VTS 57 3.0 TDI A5

   #2 24th June 2010, 17:16

   mig is fine for mild steel. they will want a few quid for a cat since theyre worth a few quid scrap value, probably as much as a 2nd hand decat
3. FunkyDave Infrequent Poster Joined: Jun 2010 Preston, Lancashire Posts: 235 2001 Renault Megane 1.9DTi

   #3 24th June 2010, 17:22

   U recon? How much do 2nd hand de-cats go for?
4. wildrenegade Infrequent Poster Joined: Feb 2005 fleet United Kingdom (England) Posts: 234

   #4 24th June 2010, 18:04

   cant you sell the 2 cats back thou, as its the metal in the cat thats of value and he needs neither
5. marcusd Saxperience Post Whore Joined: Jan 2009 warrington Posts: 7551 posi blue mk2 2003 vtr

   #5 24th June 2010, 18:07

   could you not buy the one and use some other steel pipe to fill in the blank? not clued on this stuff to be gentle
6. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

   #6 24th June 2010, 18:07

   why bother? its £11.99 or something for a mk 2 centre section? this will decat a mk1 like a straight through centre pipe? it would probably cost you more then that at the scrappy
7. Lewis Saxperience Forum Bum Joined: Oct 2009 Middlesbrough/Coventry Posts: 3808 Megane 225

   #7 24th June 2010, 18:24

   Quote:

   Originally Posted by blackie_2k5 why bother? its £11.99 or something for a mk 2 centre section? this will decat a mk1 like a straight through centre pipe? it would probably cost you more then that at the scrappy

   What i thought, Mk2 1.1/1.4 centre section is what you need
8. Andy_K Saxperience Post Whore Joined: Jan 2004 in the garage trying to fix the car Posts: 5882 Mondeo st tdci & Supercharged vts

   #8 24th June 2010, 18:59

   Or why not buy the 1 spare cat and batter the insides out so its hollow?
9. Lewis Saxperience Forum Bum Joined: Oct 2009 Middlesbrough/Coventry Posts: 3808 Megane 225

   #9 25th June 2010, 17:45

   Quote:

   Originally Posted by Andy_K Or why not buy the 1 spare cat and batter the insides out so its hollow?

   Because the platinum in the cat is valuable and therefore expensive to obtain. Would be cheaper to buy a decat pipe.
10. r33ryan Infrequent Poster Joined: Oct 2009 Posts: 133

    #10 25th June 2010, 18:43

    for all the mucking about a decat is about 50 quid, all exhausts should be bent the only time welding is needed is to weld flanges on, there is a good chance a second hand cat will be almost rotten and almost imposible to weld.
11. Andy_K Saxperience Post Whore Joined: Jan 2004 in the garage trying to fix the car Posts: 5882 Mondeo st tdci & Supercharged vts

    #11 25th June 2010, 20:31

    Quote:

    Originally Posted by L_E_W_I_S Because the platinum in the cat is valuable and therefore expensive to obtain. Would be cheaper to buy a decat pipe.

    I may have misunderstood the OP's intention regarding getting 2 knackered centre sections and chopping the cats out. see your point if he was taking the centre pipe and leaving the cat in the scrappies
12. nathgvtr Regular Poster Joined: Jan 2010 Posts: 253

    #12 25th June 2010, 21:29

    why dont you just buy a legnth of exhaust tube from an exhaust specialist, shouldnt cost loads an then weld it up like you wher going to do anyway.