I got a jspec engine first off and idk how but i just noticed it was a tube thats cut off. Idk how i missed it.. but where does this hose go? Its about as thick as my index and my middle finger and looks like it goes down to somewhere. Now i do have some block off plates i haven't put them on yet thou. So do i get another tube? Or just take it off and finally put in my block off plates?

 

It's likely the split air pipe. If you're running a cat, you need to get another/modify what's cut-off to reach the main cat.

 

I dont have one so just use block off plates then?

 

You can block it off.