speedwerks,boondocker turbo or stock 2010 pipe on 09 m8T?

[Mod800R]

hey all,

Wondering if anyone could spare some feedback on any these pipes?

am running a stock engine and pipe 09 m8 with a twisted race gas kit...looking for a bit more without turning up the boost...thinking porting and a pipe?

is these pipes really make 20hp on pump gas turbo kits? if so at what elevation?
is the hp gains elevation specific?
any gains when the boost is turned up?
any tuning issues or loss of bottom end power?
cracking problems?

any feedback would be great!