L86 sucking through a 37mm restrictor

[IARLLC]

Just looking for helpful hints. We have had some fun setting up some 2017 L86 Silverados for an upcoming Rally only to find out that they have to suck through 37mm restrictors.... Have just a few days to get them to work well with the new intake obstruction... I will welcome any hints.

Looks like the restrictor will sit just ahead of the throttle body and the MAF is in the stock location. MAF and VVE tuning should go well enough but predicted torque/predicted airflow stuff will be interesting with just a few days to prepare. They did not have us go ahead with unlocking the TCM (not expecting the restrictors) so they are going to have to let off the gas if they ever want to shift...

Update:
All went as expected. MAF is down by 35% up top. Once airflow models were worked out they drove pretty well up to 4500 RPM. I just wish they had gone for the trans tuning so we could shift them at full throttle 1000 RPM sooner. One note though...without the cam tuning they would have been pathetic.