When trying to Fix an Exhaust Leak on my Aygo turns into Replacing the CAT

Bit of a long Video, I start of trying to fix a Exhaust leak at the joint of front pipe to CAT, but after testing I discover a small pin hole in the body of the CAT and have to replace this, but rather than spending Hundreds of pounds on a new well known branded one, I decided to try a cheap one off a Well known auction site for £34. and my thinking was if it didn't work I've only lost £34 and if it did work I've saved money.