Any experience of DPF removal on a 4.2 tdi??

[Bushido]

As per title, has anybody any first-hand experience on removal/gutting of the dpf on the 4.2 tdi?

I see that Darkside Developments offer by pass pipes in place of the dpf.

Other online tuners offer to gut the dpf and reinstall it.

Both can then map the dpf out and map for performance gains.

Im most interested in places in NE England but would travel for the right people.