Catalytic Convertor / DPF

[Maurauth]

I've been informed that DPF removal, and catalytic converter removal is a big no-no as it may fail an MOT, stopped by DVSA etc, but I can't seem to find any info / diagram of the C250 CDI exhaust system.

I've been informed by Acid and Imran at MSL that the best option for my car is a Y pipe split to straight pipes with quad tips. I was thinking I might get more/ a nicer sound out of it by replacing the cat with a sports cat, or a bolt-in de-cat pipe, and/or a bolt-in de-dpf pipe. Would this be the case? I'm not concerned about performance gains, but would assume I could gain single figures of horsepower from such a modification.

In laymans terms, does it go: Engine -> Downpipe -> Catalytic Convertor -> DPF -> Silencer/Muffler -> Exhaust Tip

This is a stock diagram of a single exit exhaust system:

 

[Jokuk]

Why do you want to remove the DPF and Cat ?

 

[grumpyoldgit]

I would be inclined to take Acid's advice.

 

[Maurauth]

Why do you want to remove the DPF and Cat ?

For the reason I posted originally- "I was thinking I might get more/ a nicer sound out of it ... I'm not concerned about performance gains, but would assume I could gain single figures of horsepower from such a modification."

I would be inclined to take Acid's advice.

I shall be taking Acids advice for the first step, but Imran mentioned he has done DPF and CAT deletes in the past, and that would be stage 2

 

[Jokuk]

For the reason I posted originally- "I was thinking I might get more/ a nicer sound out of it ... I'm not concerned about performance gains, but would assume I could gain single figures of horsepower from such a modification."



Apologies, thought you wanted to take the DPF and Cat out for another reason and a by product would have been a nicer sound. I looked into having a DPF removed in another car as it kept failing to regen, in the end I sold the car ! Good luck.

 

[Maurauth]

For the reason I posted originally- "I was thinking I might get more/ a nicer sound out of it ... I'm not concerned about performance gains, but would assume I could gain single figures of horsepower from such a modification."

Apologies, thought you wanted to take the DPF and Cat out for another reason and a by product would have been a nicer sound. I looked into having a DPF removed in another car as it kept failing to regen, in the end I sold the car ! Good luck.

Yeah, I know all the DPF issues, and that would be a positive to it as well

What information did you find when you looked into having the DPF removed out of interest?

 

[Jokuk]

Yeah, I know all the DPF issues, and that would be a positive to it as well

What information did you find when you looked into having the DPF removed out of interest?

It was on a Mazda 5 which are apparently renown for having problems, all the info pointed to removing the dpf and then having lots of software mods to let the EMU know what was going on and although lots of people offered the service with glowing reviews, separate searches revealed less than satisfied customers (I wasn't a member of a similar forum at the time) A lot of the issues were to due with driving style, I wasn't doing enough long runs but I changed that and all was ok for some time but after a service it went again and enough was enough - sold it ! I am sure there will be people on here a lot better qualified to advice on here but my gut feel is if it works ok leave it alone.

 

[Maurauth]

It was on a Mazda 5 which are apparently renown for having problems, all the info pointed to removing the dpf and then having lots of software mods to let the EMU know what was going on and although lots of people offered the service with glowing reviews, separate searches revealed less than satisfied customers (I wasn't a member of a similar forum at the time) A lot of the issues were to due with driving style, I wasn't doing enough long runs but I changed that and all was ok for some time but after a service it went again and enough was enough - sold it ! I am sure there will be people on here a lot better qualified to advice on here but my gut feel is if it works ok leave it alone.

Hmm, I guess it might be a case of finding someone who's a STAR expert and getting them to play with the DPF coding.

I've been informed by Acid and Imran at MSL that the best option for my car is a Y pipe split to straight pipes with quad tips. I was thinking I might get more/ a nicer sound out of it by replacing the cat with a sports cat, or a bolt-in de-cat pipe, and/or a bolt-in de-dpf pipe. Would this be the case? I'm not concerned about performance gains, but would assume I could gain single figures of horsepower from such a modification.

In laymans terms, does it go: Engine -> Downpipe -> Catalytic Convertor -> DPF -> Silencer/Muffler -> Exhaust Tip

Can anyone confirm that this is the order of our exhaust systems, and if you can remove the cat without it setting off errors, also if it is before the DPF, will the removal of the cat cause the DPF to clog up quicker.

 

[Maurauth]

Bump:

Has anyone removed their CAT without it setting off errors on a W204?

Are there any mechanics that know if removing the CAT is before the DPF and will cause the DPF to clog quicker and need to regenerate more?

 

[Maurauth]

As above

 

[Lord-WYBMAnE220]

If you're DPF/cat-deleting, keep the old pipes (with moisture absorption measures) is all I'll say.
If you intend to keep the car long-term, deleting may shorten your turbo/engine life - MOT regs notwithstanding.
If you're deleting due to regenning issues, try changing your Lambada sensor first.

 

[ju4ior]

Hi

Did you get it done?
Would you recommend it?