Engine Malfuction/ Limp mode (just installed DP's)

Hey guys i just had my AR design catless DP's installed on my 335xi and couple things going wrong. 1 is i always had a little rattle on my car thought it was the waste-gate rattle, never really bothered me but now after the dp's are installed i feel like its a lot louder. (idk if that makes sense). Also my car is a little jittery with the boost, after going WOT or just driving for 15 mins or so my car goes into reduced engine power mode and is throwing these 2 codes
-2e8e
-30ff

Yes auto-clear is on and it still continues to go into limp mode every time i turn by car back on and drive around.
What would you guys suggest that i can try without going back to shop right away.

Thanks, Ant