Fitting new back box on BMW 318

[winkyridg]

I,m fitting a new back box on to a Bmw 318, do i need some sort of seal between the new an existing exhaust part when fitting and is there any thing i need to do to protect the Catalytic converter as this is the part my back box is being attached to, thanks in advance

[AlBags]

Some have a conical seal ring .. which is usually fitted when there is a large flange .. some have a spring loaded joint to allow for movement.
I presume you are fitting as a one-piece section rear of cat?
Have you been to GSF parts? They would show you the components required to replace that section.

[winkyridg]

ALbags, yes its a one piece fitted to the rear of the cat, where is GSF parts?

[AlBags]

Probably in one of your near towns ..
http://www.gsfcarparts.com/branches.html

If out of area, and you can order parts, use Euro Car Parts ..
http://www.eurocarparts.com/store-locator

Personally, I would use GSF .. but I get great trade prices from them.