Hi I've been looking around on here a while and this will be my first post. Just bought a new to me 2008 lmm. Has 115000 miles on it and I have no idea what it's been through. It is in the shop right now getting a new turbo on the dealerships dime. I have already ordered a full mbrp 4" exhaust with dpf delete and a h and s race tuner. I have painted the exhaust now before installing. My question is should I hold of on exhaust and tuner to make sure the turbo is going to hold up, hold off on exhaust alone, or go ahead and install both. Tuner has ability to egr delete with no plate or kit. Should I do one or the other anyway. Is there any other small tricks of the trade besides air box mod? I don't want to go all out performance but want longevity of the motor and best mpg. Horsepower is a well liked biproduct. Also lets just say this will be used in endurance races offroad only.