Personally I couldn't recommend highly enough having the full kit fitted. Every time I drive the car the noise puts a huge grin on my face. With all windows down & roof open, I let her rip up in the Strand Underpass on Sunday and the wife got so 'excited' by the noise we had to turn straight round and go back home.......
Thanks for your help guys, I've just got to get them! A client of mine has them on his 360 Ferrari and Lambo Murc., and you can hear him about 1/2 a mile away in either car, simply awesome. Have downloaded the Rumore vid from Tubi IT today for the E39, I think it's going to be a done deal.
Go with the full cat-back system. I have never heard of anyone attempting to break the system up. The OEM resonators are very heavy and you will like the system without them.