O- ring in engine needs to be fixed?

I have a Ford Focus and I was told the o-ring in the engine needs to be fixed. He said he needs to check again to make sure that's the problem. I have no idea what any of that means but could anyone guess an estimate of the cost for repairs? This is all the information I know that he told me so sorry if I didn't explain well

Added (1). He said that there's no pressure from the engine and something is wrong with the o-ring, I would just like to know what the cost would be like

Can a wheel cylinder explode?

I have a 2001 Ford Focus with rear drums. Last month I had Midas replace the passenger rear drum because I needed the bearing changed, they only changed the drum no shoes or cylinder. Today, I was driving making a left turn at a light when all of a sudden a loud bang from that drum happened. Sounded like a gunshot in my trunk. It leaked out all my brake fluid and the fluid was smoking. I got home but the pedal would go all the way to the floor. Can a cylinder explode? And if so is it a safe bet to say that something Midas did messed this up?

I have this ludicrous plan, I will go to Honduras and become millionaire gangsta?

Am bored of waking up everyday, removing my curtains from the window, their lies a cloud of greyness, as I look at the dull sky i see a no silver lining. All I want is to be like that rapper Rick Ross or 50 cent with the mansions and them women, I dream that I'll make it big and get myself out of this town. The fact is am a average 19 year old living at home with my parents and they just work and come home and complain. I get angry at society, I don't want to but I can't help it. I drive Ford Focus 2004 old banga, I see a Mercedes pull up next to me. Wow I think you're one lucky man or women. I want that happiness, I know you worked your socks off etc. I say to myself and I think what if I hop on a plane, a new fresh start not my parents hovering down my neck cause I feel that way. Point is that life is just not fair without a hitch their lies the success of a man from nothing to something but that's just hitch in kids mind that'll need proving life's worth something till you dream it or make a move - Amen I pray Lord can you hear me, the pain is hell bound x

Run flat tires for any car?

So I drive a Ford Focus. I'm always worried that I'm going to pop a tire (which i already have on the highway few months ago). Is it possible to buy those kind of tires for my car or is that only a BMW thing?

My Ford Focus is so slow. How can I make it faster?

My 2010 Ford Focus ses sedan is slower than a turtle. Is there anything I can do to it to make it fast? Like it can't even keep up to speed with other cars on the freeway going the speed limit. I've seen a 2010 Ford Focus modded and it was racing on a track. So what the heck did they do to their Focus to make it fast? I've heard you can buy a chip. How does a chip work? Also what other ways are there to make it faster?

Where can i buy a 2015 focus sedan in europe?

Where can i buy a 2015 focus sedan in europe?

Added (1). update: please don't reply in a Ford Dealer. The sedan version is not easy to find in Italy and Europe in general, if you have to kindly reply please avoid unintelligent replies

Do petrol cars have Coil Packs?

Sorry if this sounds like a ridiculous question but I'm clueless when it comes to the mechanical side of cars. My car is running lumpy and I've been told to try changing the coil pack as its common to break on these cars (2004 Ford Focus 1.6 Petrol). I said to my brother about it and he told me that no petrol cars have coil packs. I think he's wrong so I want a second opinion. Can anyone shed some light on this?

Thank you for your replies in advance and Merry Christmas!