knocking

Hi guys, doing the typical 'join forum and instantly ask for advice' My SR developed a fun noise when i last drove it. started it up today to record this video isnt a constant knock so maybe piston slap? any ideas/suggestions welcome car is definitely cursed, cant drive it more than 500 miles...

Hey all, i have this strange knocking sound if you can make it out the sound i have a video below you can here it a lot louder in the car. Theres no exhaust. The knocking sounds like its coming from the turbo. Is this anything i should be concerned about? PS the car is kind of thorn together...

Hey guys:) I have a 1992 240sx s13 coupe with a welded diff(soon going to switch to vlsd) I noticed when i shift my car from 1st to 2nd it makes a pretty obvious knocking noise. I really want to know whats the problem, it's been killing me! I hope you guys have some feed back!