what tools are needed to fit a back box to a Sei? where does back come off to fit the new one? yeah i'm full of questions I have a picture took of the back of back box do I just soak it wd 40 and pull off?

from that picture i think the back box comes off beyond what you have posted

you may need to cut it and reweld on unless a full system, you may also probably need new exhaust hangers and clamps

AppleSei said:

from that picture the back box comes off beyond what you have posted

you will need to cut it and reweld on unless a full system, you may also probably need new exhaust hangers

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dam I knew it was not as easy as it looked!

An exhaust place will be able to do it for little £

Dont go to kwik fit etc as in my expereince they do not touch anything that isnt purchased from them