new exhaust no back box ???

[D n D & K]

hello all

just been looking through a few posts using the search as we need to replace the back box

to my supprise i noticed a post about not having a back box just replace it with pipe

my questions are
is this legal ( is it not noisey )?
does it not effect performance, back pressure etc ?

[scanner]

hello all

just been looking through a few posts using the search as we need to replace the back box

to my supprise i noticed a post about not having a back box just replace it with pipe

my questions are
is this legal ( is it not noisey )?
does it not effect performance, back pressure etc ?

No it's not noisy (certainly not 500bhp 1.0 litre Saxo/Corsa noisy) as the turbo has absorbed a lot of the energy and the first box absorbs most of the rest.

Those who have run without one for a while reckon the Bongo goes better without the back pressure strangling it.

My other car (also a Turbo Diesel) has a big hole in the catalytic convertor at the moment - at 120,000 miles it now goes better than it ever has done
and is very little noisier than it used to be. I shall be replacing the cat with a piece of flexi before the next MOT.

PS - The cat isn't needed for the MOT either.

[bigdaddycain]

Won't the engine management light illuminate with the cat removed ?

[ford tinny]

Hello,
Yes Vanvliet has a stainless flexi pipe instead of a back box (no problems)


I also have done this with my middle flexi pipe and box, works a treat





Thanks John

[bigdaddycain]

Nice looking job john

[D n D & K]

so you have no boxes at all on yours and it passes mot ?

[ford tinny]

Hello,
First picture is Vanvliet's Bongo with no back box and the two other pictures are of my middle flexi on my Freda

Thanks John

[D n D & K]

o i see thanks

[cheffy34]

Won't the engine management light illuminate with the cat removed ?

I'd have thought something would light up on the dash, plus i thought it was illegal on cars built after 92 j/k plate surely it would play havoc with fuelling and emissions aswell

[scanner]

Won't the engine management light illuminate with the cat removed ?

Nope - it's not a petrol so no electrical connection (lambda sensor or whatever) that I'm aware of.

It's non electronic injection (like the Bongo), it has an ECU but no electronic control of injection.

[scanner]

Won't the engine management light illuminate with the cat removed ?

I'd have thought something would light up on the dash, plus i thought it was illegal on cars built after 92 j/k plate surely it would play havoc with fuelling and emissions aswell

It's not a petrol, so not an issue.

I've been reliably informed that diesels only have to have things like EGR and a cat to be sold, once sold it appears they are no longer checked - decat pipes for tuned diesels are a common mod - either that or just smashing the core out with a hammer and big screwdriver.

[cheffy34]

Ahhh thanks scanner never had a diesal did borrow one once tho

[scanner]

Ahhh thanks scanner never had a diesal did borrow one once tho

You have experienced the future once then?

[bigdaddycain]

Won't the engine management light illuminate with the cat removed ?

Nope - it's not a petrol so no electrical connection (lambda sensor or whatever) that I'm aware of.

It's non electronic injection (like the Bongo), it has an ECU but no electronic control of injection.

Right... i'm with ya.

[vanvliet]

Mine has been without a box on the rear for about a year and a half. ( stainless flexi and chrome tailpipe) Works fine for me /have not had to maintain it in any way and I have never had any comments about it being loud .I swear that is a bit nippier on acceleration too If it falls off tomorrow I would not fit another rear box. The van has Passed MOT no problem