Datatek said:
I think your car will have a cut out in the rear valence for the single exhaust, the twin system turns down and stops short so the cut out is not needed. Looks odd with the cut out one side and not the other with the twin system fitted. BMW (they are the ultimate image purveyors) fitted the twin system purely for image so the diesel looked the same as the V8 from the rear.
If you want to improve the gas flow, remove the cat if yours has one.
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Yes Mr Datatek sir mine has the cat, is there a de-cat pipe i can get or is it gona be me, my weilder and i :hysterically_laughi (lol) and a bit of straight pipe, And i did notice the cut out, i was just going to offer up the new twin box and see if anything needed chopping or changing. Does your have twin cut outs in the rear valance (making it an age differance)
 
Does your have twin cut outs in the rear valance (making it an age differance)
Click to expand...
No, the twin pipes mounted behind the valence and then the pipes pointed down so you don't really see them.
 
Mike v.t.s said:
Yes Mr Datatek sir mine has the cat, is there a de-cat pipe i can get or is it gona be me, my weilder and i :hysterically_laughi (lol) and a bit of straight pipe, And i did notice the cut out, i was just going to offer up the new twin box and see if anything needed chopping or changing. Does your have twin cut outs in the rear valance (making it an age differance)
Click to expand...

As Derek Ward said, no cut outs in the valence on the twin pipe version. You can buy a new rear bumper with the correct vallence for a couple of hundred quid if you want it to look right.
 
Mike v.t.s said:
Im looking into a possible de-cat pipe and getting rid of the center silencer, did you make your own mods to your exhaust or did you do it yourself :D
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i did the mods myself, a nice bit of 62mm stainless if my memorys servs takes the place of the weighty and restrictive box and cat. you can flog the cat after aswel and make the money back you spent on the stainless, win win.:D
 
Lets say you de-cat the exhaust and remove center silencer, where would the vehicle stand in relation to MOT and emissions test?
 
DM68 said:
Lets say you de-cat the exhaust and remove center silencer, where would the vehicle stand in relation to MOT and emissions test?
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Only thing a diesel is tested for is smoke. So decatting one is no problem they don't make a lot of CO2 anyway. Removing centre silencer would make it throatier. But there is the part of the MOT that says make sure no parts of the exhaust are missing to get over. But most would think that means check that the tail pipe has not fallen off. Just depends how clued up your tester is. Plus the fact that if the vehicle was made in or after 1993 it has to be fitted with a cat by law which most moders seem to ignore.
 
wammers said:
Only thing a diesel is tested for is smoke. So decatting one is no problem they don't make a lot of CO2 anyway. Removing centre silencer would make it throatier. But there is the part of the MOT that says make sure no parts of the exhaust are missing to get over. But most would think that means check that the tail pipe has not fallen off. Just depends how clued up your tester is. Plus the fact that if the vehicle was made in or after 1993 it has to be fitted with a cat by law which most moders seem to ignore.
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Tony, does the 1993 law re cats apply to diesels? I thought that was the date for petrol, but memory is not so good these days.
 
Datatek said:
Tony, does the 1993 law re cats apply to diesels? I thought that was the date for petrol, but memory is not so good these days.
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To be honest Keith i don't know, i thought it was all vehicles from that date. You would have to trawl the construction and use regs for that info.
 
wammers said:
Only thing a diesel is tested for is smoke. So decatting one is no problem they don't make a lot of CO2 anyway. Removing centre silencer would make it throatier. But there is the part of the MOT that says make sure no parts of the exhaust are missing to get over. But most would think that means check that the tail pipe has not fallen off. Just depends how clued up your tester is. Plus the fact that if the vehicle was made in or after 1993 it has to be fitted with a cat by law which most moders seem to ignore.
Click to expand...


:D:DDid this on my 4.6 as a quick fix to pass the MOT as it was sucking in air through the many holes throwing out the lambda readings, welded in a piece of straight pipe sounds lovely and passed the MOT without a problem.:cool::cool:
 
Cheers Wammers, so basically the diesel (which i have) will pass emissions but you run the risk at MOT time,depending on how keen the tester is. May be on the list of future jobs then.
 
DM68 said:
Cheers Wammers, so basically the diesel (which i have) will pass emissions but you run the risk at MOT time,depending on how keen the tester is. May be on the list of future jobs then.
Click to expand...


Diesel engines do not need a cat for mot:D, even if they had 1 from new... its allways been this way and ive checked with a friend who works for VOSA, he basicaly sends cars to mot stations that have allready been tested by the ministry to catch out rip off mot'ers and dodgy ticket issuers:eek:. (bastards trick really in one sence) but at least there shouldnt be as many death traps on the road like some 1 on here got stitched with.:(
 
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