Cm870 upgrades

[Running rough]

For what it's worth I did a 870 to 871 conversation on my 2005 870, had to get 871 ECM and turbo from truck wrecker along with engine harness, also had to reposition a few wires on oem harness and a different tps senser, I feel it is a step up but it will cost a bit more to go this route, However I still think a guy can tune the 870 with the original turbo or even a wastegate and get pretty good results performance wise, I just think an 871 turbo will give a guy the edge with fuel economy and spool up, however it all comes down to the tune in the end for the most part