01 cobra goes poof on dyno

Finally got the money for my supercharger (Ati Procharger P1sc 3core intercooler) I drive down to Pahandle Performance after waiting a dreaded week of not being able to smoke the tires; to watch the dyno runs. At 8psi it made 412rwhp/413 tq on a mustang dyno. So on the last run before i get the car back in my grasp POOF.... there goes the compression in the #8 piston. So what a run of bad luck What you guys think of Ross pistons and Scat rods? a good choice? i also am getting a new fuel pump to support the 14psi i am gonna be running with the car gets it new makeover. I am also getting some head work done to prevent smoke from coming out the back. I'll sumbit the new dyno numbers in a months time. Enjoy your COBRA guys I know i do... errr did

wheels and tires

Forgot to mention getting the bullit rims to go on it as well
17x8.5 front and 17x10.5 for rear.. going with nitto d/r 315/35/17s for rear so hopefully i'll get a little better traction.

Also with underdrive pullies, shorty headers, 3.73s,magnaflow mufflers (love the sound ) bbk o/r x-pipe, bbk cold air and eibach springs i made a best of

13.20 @ 104

Just curious how well does the IRS hold up to high hp/tq? Should i consider beefing it up or go with something like a ford 9" rear end?