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[zuluf]

Ok, I've stumbled upon some unknown (at least to me ) stuff on my engine (for example a small odd looking pipe on my exhaust branch) and was wondering what was that bla-bla-bla and found out what it is.

Now the question(s) is(are):
What are the prons and cons of having it on board?
What are the pros/cons of removing it? Consequences to the engine, entire car?
Any performance/fuel consumption/etc increase/decrease if removed?

I've poked the forum/internet a bit but still I'm not clear on that so if anyone is willing to pass on the info or redirect me to some...

P.S.
Just don't tell me that I'll fail the MOT because of the emissions (it isn't a problem) 

[Abiton]

Are you sure you're not referring to the Secondary Air Injection system? That has metal pipework going into the exhaust manifold, with rubber pipework leading to a big round metal non-return valve.

EGR valve is the thing next to the DIS, right over the back end of the head, often rather rusty-looking.

[zuluf]

Hmmm, you might be right.

Yup, then I'm referring to SAI system

But still info about both SAI and EGR would be welcome because I'm n00b for both stuff!

WTF is a DIS?    o.O

[Abiton]

Distributorless Ignition System, all-electronic, what the HT leads come off.

SAI can be completely removed without any real penalty, but you obviously need to block up any resulting holes.  It improves the speed at which the catalytic converter and lambda sensor warm up from cold, to reduce cold-start emissions.  Sounds like you don't care about that so disable/remove.

EGR can be blanked off by inserting a steel plate of appropriate dimensions between the EGR valve itself, and the alloy chunk it sits on.  Benefits: won't matter if the valve gets sticky/stuck, alleged to improve throttle response slightly (probably only if it was already sticking/failing).  Downside: will increase nitrogen oxide emissions (you don't care though?), and may slightly increase fuel consumption at cruise due to pumping losses being increased slightly.

[zuluf]

Ok, fair enough!

Plain and simple info, thank you