exhaust

[muddymud]

does any one run a straight through exhaust on a 200tdi? i have ordered a middle box removal thing but i have no idea what to do at the back was thinking about getting something like this  :

http://cgi.ebay.co.uk/SAVAGE-UNIVERSAL-EXHAUST-BACK-BOX-3-TWIN-ROUND_W0QQitemZ390026243547QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item390026243547&_trksid=p3286.c0.m14&_trkparms=72%3A1301|66%3A4|65%3A12|39%3A1|240%3A1318

or:

http://cgi.ebay.co.uk/SAVAGE-UNIVERSAL-EXHAUST-BACK-BOX-LETTER-BOX-STYLE_W0QQitemZ390026243420QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item390026243420&_trksid=p3286.c0.m14&_trkparms=72%3A1301|66%3A4|65%3A12|39%3A1|240%3A1318

or:

http://cgi.ebay.co.uk/SAVAGE-UNIVERSAL-EXHAUST-BACK-BOX-TWIN-SQUARE_W0QQitemZ390026243399QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item390026243399&_trksid=p3286.c0.m14&_trkparms=72%3A1301|66%3A4|65%3A12|39%3A1|240%3A1318

which one do you think i should get or should i go with the standard 1?

Cheers,
Nick

[hotdog]

i only use the down pipe to the first joint no boxes no trim

[mikiep1986]

all i've done on mine is cut the back box off still gota take the centre box out yet ?

[bogie]

u dont need boxes,just cut em out ,they only rot n replace with pipe.sounds great!!!!!!!!!!!!!!!!!!!!!!!!!!!

[J B]

ive used a SS sports exhaust on my 300tdi, which disposes of the middle box, ive also cut out the cat/particle filter
leaving just the back box
it makes a lot of differance 

[turbonutter]

just cut all the boxes out , iv done away with all mine and made it a side exit at the same time

sounds pretty good and very cheep !

[mikiep1986]

im guna have to get the centre box out then . . .

[boss]

i have a small straight through mullfer on mineand thats it. is a bit loud but then it does exit just behind my passinger door. the improvement in responce time was quite impressive!

[atlast]

this is something im planning on doing asap :), as my disco has been pumping out the black smoke for so long im thinking the boxes prob full of muck, nice SS 3" all the way 

[meader]

there may be a few probs with a straight threw exhaust my mate has that on his and he was lucky to pass the mot with it as the noise is excessive next year he has to put a box in.the law has changed on exhausts now for mot's so he was told

[spy]

I have just put straight through side exit on my 110 (disco 200tdi engine).  Speaking to a mate who is an MOT tester its nowhere near as loud as some chav motors.  Also he said, there is a max decibel alowed for exhaust but like most places they have no way of measuring decibels.  It would have to be painfuly loud before he even considered failing it.

If I ever had one that failed on noise levels I would be asking the test station to prove the level in decibels before I mentioned it to VOSA....

[karlo]

It will fail if it's a petrol engine not if its a diesel if you remove the cat.

[muddyoffroader]

IT WILL FAIL WITH NO CAT, KARLO IS RIGHT! :clap: YOU COULD PUT AN OLD CAT ON IT WITH ALL THE INSIDES KNOCKED OUT BUT KEEP YOUR GOOD EN FOR THE MOT's. :dance: the reason i say use an old one is if ye ever get tug off the old bill accompanied by vosa when they look for a cat it looks like its still there. ye usually get approx 6 to 15bhp more depending on the engine when the cats removed.

[muddymud]

i think im going to go for a straight through and put a poformance backbox on the back to give it abit more beafy sound as the 200tdi sounds alot like a tracter with no exhaust and as im only 17 i like my cars deep and loud  :D but will i loose power with just a straight pipe?

Also both my mates who have diesul cars both with a de-cat exhaust pass the MOT every time, it depends on what care and the age i think!

Cheers,
Nick

[Porny]

my disco is a 1997 300tdi which has to have a cat on at that year anything b4 1985 dont need a cat even if fitted you can remove them as they dont come into a mot

You do not need a CAT on any diesel!!!

The current 2008 MOT system for Diesel (i.e. compression ignition) vehicles only requires an Opacity test, (i.e. smoke) and not an actual emissions test as per petrol (spark ignition engine).
The  catalytic converter (and EGR system for that matter) does not actively affect smoke….  This differs from a diesel particulate filter (which is also exempt from testing at the current time).  The only requirement is that the max smoke value for a turbo charged diesel is a mean (of the last 3 smoke tests) not exceeding 3.00m-1.  For an initial 'fast pass' the smoke value must be below 1.50m-1.


In simple terms.... the only reason a modern diesel have CATs and EGR (along with other things) is to enable a manufacturer to meet the current EU legislation (for example EU4/5), but once a vehicle model has been type approved, and sold to the customer...  the customer is technically free to do what they like regarding emissions, as long as they meet the requirements of their country, which in the UK is just the MOT test.

For Petrol/Spark Ignition:
The catalyst test is part of the MOT test for most class IV spark ignition petrol engined passenger cars with four or more wheels first used on and after 1 August 1992.
Carbon monoxide (CO), hydrocarbons (HC) and lambda (~)  are checked at fast idle speed and carbon monoxide (CO) is checked again at idle speed.
The test should be self explanatory using the automated routine on 1996 specification exhaust gas analysers   The following points should be borne in mind.

This can be confirmed by reading the MOT manual - http://www.motuk.co.uk/manual_740.htm and here for petrol (source of above quote) http://www.motuk.co.uk/manual_730.htm


Ian

[Mikieb1981]

my disco is a 1997 300tdi which has to have a cat on at that year anything b4 1985 dont need a cat even if fitted you can remove them as they dont come into a mot

Think its anything before 1993 doesn't need a CAT not 1985 on petrol cars anyway.  Don't know about diesels!

[bilge rat]

just to add what porny has put , ive just m.o.t'd my 300 . no egr ,cat removed ,no ctr box. the tail pipe is now where the ctr box should be and then exits out the side. i did cut the pump down a bit but the smoke test was 0.47. not bad with 200,000 on the clock too so i wouldnt worry about cats egr's or anything else .. alan