I have only had my M5 for a couple weeks.My thoughts:Conforti chip(had one in my 535is liked very much no problems),cam gear Dinan?(don't know much about this/keeps exhaust valve open little longer uping performance.?.?),I have always been of the school of thought,that after market air cleaners are not a good thing(noisey & introduce contamination into expensive engine)I was surprised,that my mechanic recomended this for the M5,while poopooing it in the past(your thoughts???),B&B Tri-Flo exhaust(my car has new stock exhaust/perhaps in several years as needed/quieter is better,when driving like Steve McQueen on public roadways),Bilstein sports are the existing shocks,I may buy a set of 540 brakes from my neighbor. I'm sure some of you could respond with a book ,as long as "War & Peace".Please take the time to let me know your personal experience & thoughts.Thank you Chris