Bigbore500r. Any damage you might do to your motor is easier to identify pre turbo. The exhaust gas pre turbo is what you want to watch. I'm not sure how you could determine egt post turbo and pre turbo unless your running two temp gauges.
Don't go post turbo what ever you do. Pre turbo in the collector. Dip your drill bit into wheel bearing grease and drill slow. Same with your tap. Shop vac when your all done.
Selling our expedition. 5.4 V8 with Automatic transmission. Leather interior. DVD entertainment center. Great stereo system with Sirius radio. Heated and cooled front seats. Front and rear air controls. Vehicle is in great condition. Asking $7250 obo