The BlueBomber mod is basically cutting the MAF housing tube out of the stock air box and using it in place of the MAF housing of an aftermarket Intake
The reason for doing this is the Celica's MAF is calibrated to calculate the air flowing through the 2.5 inch pipe with fins used in the stock air box, most aftermarket Intakes
are using a 2.75 inch tube without the fins, thus when the MAF finds itself inside a larger opening the air flow readings that it sends to the ECU are slightly off, thus the ECU miscalculates the amount of fuel to add; this Sometimes results in bogs and Check Engine Lights.
You can find an install guide for this mod over at new celica dot org.
The TPR Intake
is the only Intake
that I know of to use the same MAF dimensions as the stock air box, unfortunately there is a long waiting list to get them.
Its called the Blue Bomber mod because he invented it, and actually did it; props to him for doing so.