its cheaper because they are chopping your DPF up!
When the new 2012 DPF law comes in, i can simply refit my Old DPF for MOT, All of you who have gone for the cheap option now will have to buy New DPF's for your MOT at a price of around £1200
Spoke to a MOT tester regarding the law and all 58+ Cars will require the DPF to be in place and Operating from Jan 2012- onwards
Now i know somebodys going to reply now and say well my DPF is in place but the internals are missing, It will still fail as the smoke levels coming out of exhaust will be over that of one with a DPF In place