^^You don't need a turbo timer or any kind of boost control for longevity. If you are strictly looking for longevity, don't change anything!
Good maintenance is the only thing you need to worry about. If you are really concerned, frequent fluid changes and synthetic fluids would be your best mod. Turbo timers are a concern of the past. The new systems have some kind of design where after you shut off, coolant still circulates through the turbo. That being said, don't floor it and then turn our car off. A minute of normal driving should be enough. Nobody here that I've seen uses a turbo timer anymore.
Maybe look into a catch can, but I don't really think that matters for reliability.
'05 XT 5 spd VF - SOLD
'13 XT Touring