I've been informed that DPF removal, and catalytic converter removal is a big no-no in the UK 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 (UK Mercedes Specialists) 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:

 

Bump!

 

If you're only looking for sound, why don't you just remove that little muffler? It looks pretty small, so I would guess it wouldn't become too loud, especially with the cat and DPF still in tact.

 

From the picture below you can see that you can't remove the muffler and keep the tip the same because is almost one with the muffler. You can remove the resonator. The pictures are from member who change their exhaust but i think its from CGI engines. I dont know if CDI engines have any differences.

 

I'm having it fully custom made so I don't need to worry about the tip being attached to the muffler.

 

Post a video and some pics when you are done!! ;p
Do you change the air filter to BMC?Any review for it...