Yesterday:
A guy came to Dyno his Nissan Patrol 4.8 with a bolt on turbo charger and boosted to the sky.
Place it on the Dyno and 1st gear pull we notice overboost, and abort the Dyno run. Guess what? The engine couldnot take the free reving once the foot was removed off the accelerator, The Crankshaft gaveway! Yes the Crank broke!
Morale of the post: bolt on turbo kits does not mean you can do it at home: