hehe fancy seeing you on here... it was my exhaust you bought :cheers:
I am not sure why your pipe has stuck tight but have you tried yanking the connection tube ( the one that connects to the right hand side can)? The other thing is make sure the collar clamp has fully released. Mine was a bit stubborn so I had to pry it open witha a screwdriver. Apply WD40 liberally onto the connection points as well when fitting the Arrows.
When you fit it I am sure you will be in for a WOW!!! its a beast of a pipe.
Enjoy enjoy enjoy