goaty Posted April 18, 2008 Share Posted April 18, 2008 hi all. I have a disco 200tdi in my 90 and at the mo the downpipe is a bodged up home made thing by the bloek who converted it before i got it. It really does look nasty, so i a thinking fo changing it. Now i have seen the conversion pieps such as steve parkers, but i have one question really. All the avliable downpipes seems to be made from 2 inch pipe, now is this suitable or would 2.5 inch be better???? Am i being just to fussy or are they perfect for the job?? i only ask as my exhaust system is a 2.5 inch system, mating them up shouldn't be a problem. cheers goaty Quote Link to comment Share on other sites More sharing options...
Les Henson Posted April 18, 2008 Share Posted April 18, 2008 Ideally your exhaust inner diameter needs to be the same as the exhaust manifold inner diameter. Les. Quote Link to comment Share on other sites More sharing options...
Eightpot Posted April 18, 2008 Share Posted April 18, 2008 The Steve Parker one is the same diameter as the turbo outlet, so I think 2.5"? The second stage section of it though is smaller diameter and looks a bit restrictive - it's only a 90 degree bend, so I got rid of this, bought a standard tdi defender downpipe, cut the ends off. It's a good half inch wider inside diameter, and a downpipe's only about 18 quid. In fact, without looking I might have just cut the engine side of the downpipe leaving the other end with the flange intact to meet the centre box - I tried a few permutations over time... Quote Link to comment Share on other sites More sharing options...
goaty Posted April 18, 2008 Author Share Posted April 18, 2008 think i will do similar to you, just cut and weld something up and save the cash. Quote Link to comment Share on other sites More sharing options...
lrfarmer Posted April 18, 2008 Share Posted April 18, 2008 this is the one i made for mine works very well no loss of power cost me 2quid for a bit of 100x8mm flat steel cut a 2 1/2" hole drilled 3 10mm holes and cut it to shape but a had a gas exe so that made it quick i should have used 10mm alen key bolts but will use them when it has to come off Quote Link to comment Share on other sites More sharing options...
Les Henson Posted April 18, 2008 Share Posted April 18, 2008 Here's three I made [showing off] [/showing off] Les Quote Link to comment Share on other sites More sharing options...
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