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The weak point of the 4.0 is it's hyperpathetic pistons... they can take a lot of power but not detonation... main issue is the rings are so close to the top of the piston that the ring landing is very thin and is prone to breaking off...

Most FI guys are running over 300RWHP with no issue... the turbo guys a bit more... the x-charger guys a little less... there currently is no intercooler option for the X so they run a little less boost... although you can install the X-Wet kit (or any other water/meth kit) and get some more HP...
 
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