D16y8 SOHC swap to DOHC B Series?

Is it easy to swap a d16y8 SOHC to a b18 or b20 DOHC. What things have to swapped other than the motor. I have a 2000 honda civic

Where can I buy a Honda Civic Si under 5k?

Yes I looked on autotrader and the Si model wasn't even an option so I'm wondering how the hell I'm going to buy one. I want a cheap car with under 100k miles to work on and these look like beasts riced out but where do people get them? And is it possible to get old cars factory new with under 5k miles or is that unheard of.

How to turn the front passenger airbag on in my 2014 honda civic?

My family just got a new honda civic (standard model without the touch screen) a few weeks ago and haven't had any problems until just this weekend. For some reason the passenger airbag off light came on. It is like this all the time, so it's not an issue of someone sitting in the airbag deploy path. As far as we know, nobody touched any buttons, but we don't know how to turn the airbag back on.

Any help's appreciated.

Flashing Check Engine light with codes P0300, P0302, and P0303?

I have a 2004 Honda Civic with about 240k plus miles on it and just yesterday I started the car and it rumbled and after a little bit of driving the flashing check engine light came on. So the deal is like when I start it it's kinda a weak start but I mean it doesn't sound like its having trouble starting like it doesn't hesitate or anything its just weaker and it'll start rumbling. And when I'm just sitting idle my car rumbles and shakes but not too vigorously. But when I'm driving, car seems okay driving and everything seems smooth, just except for when I'm idle or when I start it. The check engine light starts flashing the moment I put my foot on the gas then it'll flash the whole drive.

The codes I got from autozone are
P0300- random cylinder misfire
P0302- cylinder 2 misfire
P0303- cylinder 3 misfire

Do you have any idea of what specifically could be the problem? I'm not a car engine kinda person so please don't tell me to check under the hood because I will not be able to tell what is going on. If you have an idea, could you tell me an average price for fixing? Please and thanks!

1994 Acura Integra Ls vs 1996 Honda Civic Ex?

Which car is better and why? Which car is fun to drive in? (Yes I plan on adding some after market parts on it) I'm getting a car for myself (my second car) and they both have great gas mileage which I love about them but which is more fun to drive? I previously owned a Mazda protégé which I hated so much but gas was great on it but no fun I sold it. Help me out here please anything helps (any opinions/reviews/facts) thank you so much.