#2
There are some discontinued Boss pedals from the early 90's or late 80's (i forget which)

It is called a Boss Super Distortion & Feedbacker (THe model number is DF-2)

You can only get them on Ebay now for around 100 bucks.
#3
And also because his amp is turned up really loud.

Pretty much all guitars do that if you turn the amp up pretty loud without any noise suppressers.
#4
ya he doesnt use any pedals so thats not it. I dont get what you mean itll do that if your amp is turned up really loud.
#5
pretty much turn your amp up to 5 or 6 and put your guitar in front of the amp.
it will feedback.