I have just posted this in the S type forum and thought I would try here being in the U.K.

I have a S type R and have bought a pair of magnaflow sports cats (59975) to install. Can anyone recommend anywhere in the U.K. (West Yorkshire) where I could have them fitted and a rough cost?
Also would it be recommended to replace all 4 sensors while in the process? Any recommendations on the best place to buy from at the moment would be helpful too!

Thanks
Pete