I don't think it's a matter of cleaning the sensor since you are getting codes for both the MAF and intake temp circuits. It's more likely an electrical problem. You can remove and inspect the MAF easily so by all means do so, then reinstall and plug it back in and see if the codes come back. If they do and there is nothing visually wrong with the sensor take a very close look at the wiring, follow the harness back and look for damage. Retrace your steps from the uppipe install to figure out what might have happened.
A new MAF is around $200 so you don't want to buy one unless it's really bad.