Hello

My 335d has 17K miles on it. I am very interested in doing the ERG block, SCR delete, and DPF delete. OR should I just purchase an extended warranty and not do these alterations?
If I do the alterations who can do this? where do I get the parts? And will this prevent my car from passing emissions? Also, is there a way to alter the changes for the emissions test and
easily go back?

Any information is greatly appreciated.