My car just is not ok

Right I bought this S13 with a CA18DET back in January, drove back from Scotland and it drove back alright apart from running very rich. Took it out a few weeks later and blew a boost pipe off so thought nothing of it, limped home and re fitted the pipe. Started the car up and now it's just misfiring ridiculously bad, smoking like **** out the exhaust and oil near enough pissing out the exhaust. Changed plugs and old ones were blacker than black. Car still runs like a bag of crap. Any ideas??! Bought a beemer now and have just lost any interest in this car completely but would like it running so I can sell it!

How do you know it was running rich? AFR gauge? Is it standard?

Assumed it was running rich because of how much it smelt of fuel. And no it has full exhaust, intake, intercooler. Just bolt ons

Turbo oil seals perhaps

Has a brand new turbo on it which makes it even more confusing

Are you running safe boost?

As far as I know it's running standard boost. It's just strange how it all seemed to happens after the boost pipe blew off, like it wasn't misfiring or anything before that?

Go and check all the air and vac lines.