Dinan products won't void warranty

[Foxx]

I live in NYC, but I bought my xDrive in Boston. My dealer in Boston tells me they're about to get Dinan back as a certified mods provider (again) after years.
Beside having my reg warranty, I also purchased an extended warranty, which means I'm pretty much stuck with a stock car unless I'm willing to give up on my warranty, obviously beside the esthetic changes.
I have all possible pkgs, Sport, Winter, Premium, etc, so I'm not unhappy, but I always put the extra mods on my cars, as most of us here.
I guess I will wait for the Dinan Stage 1. 2 and 3, still not sure about lowering the car, although I know Dinan won't provide that anyway. I do want my exhaust sys replaced asap though, but I really don't anything about Dinan's exhaust, are they any good? anybody here has one? What else will Dinan offer for our E70s?
Has anybody else around the country heard about Dinan becoming a certified vendor for BMW?
Thanks all!