uberstang1

don't need power to break those, i beleive they were recalled at one point, they are infamous for it.

MU71L4710N

my first manifold cracked and its even got the aluminum crossover (cracked where the crossover meets the manifold). they are retardedly weak and someone at ford should be executed for putting plastic on the top of the motor.

they dont crack from HP, they just crack from heat, vibrations, rapid temp changes, whatever it is that makes em crack but its not horsepower. horsepower wouldnt have anything to do to crack it unless you were blown...then the plastic will probably crack from the FI.

stanglvr416

intake cracked dude time to upgrade to the PI intake. Same thing happened 2 me a few years ago and to countless other pre PI owners.

1fstblckgt

Go for PI swap if it is the manifold.

+1 your engine is really clean..