Straight through pipe - legal ?

[wheels244]

At Driffield I purchased stainless downpipe to remove the CAT, also stainless middle pipe that gets rid of the centre box for my 300tdi Discovery.
I was going to put a stainless rear pipe with silencer on, but have started thinking - do I need a rear silencer ? Would a straight through pipe pass an MOT?
Would it be too loud ? I'm thinking the turbo knocks most of the noise out.

What do you think ?
Anyone else done it ?

[ben_haynes]

yes we had a customer with a disco 300, which had a straight through 4" bore exhaust and had de-cated passed 5 MOTs

[Paul]

I've got a straight through pipe on my 300tdi, Never had a problem with the MOT and it sounds loverly  :D

[wheels244]

Thanks Ben

4"  :shock:

I think mine is 2".
What did that one sound like ? I don't want mine to sound like a tractor  8-[

[wheels244]

Cheers Paul.

I think you've just swung the idea of fitting a side exit exhaust with no silencing  :dance:
Out with the TIG welder  :D

[lee celtic]

when finished can we have a youtube sound recording  :lol: :lol:

[ben_haynes]

yes it sounded mean, didnt sound like a tractor from what i can remember

[Rich_P]

All the ones I have heard sound like a tractor, and rightly so they should!  Proper diesel engines. 

[ian_s]

my 200tdi runs a bodged up 2.5" side exit exhaust,
the turbo muffles most of the noise til you open the throttle  :twisted:
mine has apparently caused small children to spontaneously burst into tears :D

[adafish]

my 110 Doublecab has a straight thru with side exit..sounds awesome and ya can hear the tweeked turbo whilst....like a diesel train

[Gav_T]

My v8 disco have only got the cats on, the rest is straight through with a side exit. Sounds sooooo much nicer than the 300 tdi it was on last 

Gavin.

[Lord Shagg-Pyle]

I suppose a diesel through a straight through pipe would sound infintely better than a dustbin sized rear box on a 1.4 Saxo.

[HiFonics]

A tuned TD5 with straight through pipe sounds like this

http://www.youtube.com/v/u7UOakf6_vQ&hl=en

On my 90 I had the same exhaust system but with a silencer as I was advised the setup in the video was a bit noisy to live with.

Ben

[Rich_P]

That TD5 sounds just like one of the tractors at the farm, just slightly higher pitched!   :dance:

[carbore]

I cant remember what the date is, but im 99.99% sure that vehicles manufacturer after a certain date MUST have a CAT fitted to pass an MOT, EVEN IF it passes on Emissions, technically a visual check must be made to see if its in place.  That said I know a few people with Elises that have never had a problem!

Can anyone confirm that date?

You can just knock the middle out of a duff cat, I had to do that at a race last year when my cat blew apart in practice. Looks like a cat form the outside but no restriction on the inside.

[bilge rat]

dont know about the date but we always had to refit the cats to get them through the emission test, makes a big difference to a petrol .totaly different test. ive not got one on mine no probs doesnt alter the smoke test as i know but you may be right . might be a similar thing to the anti roll bar thing... took them off too.  alan..

[HiFonics]

I dont believe there is any requirement to fit a catalytic convertor on a car in the UK. Although to meet the emissions levels on a modern petrol engine I think its virtually a requirement. On a diesel engine you can remove the cat with no issues.