I'm hoping to be at about 900WHP after the next Month or so. My understanding is the reason the A8's can hold that 900-1000whp is due to the torque management and cutting fuel during the shift. A lot of guys on the HP Tuners forums were breaking the trans by disabling torque management and removing the cutting fuel part and they were mostly stock.
Been building the supporting parts up to handle the extra power like 1-Piece Driveshaft, Catch Can, Rear diff, wider wheels and tires etc.
Now i've added LT Headers, CAI, 180 T-stat, Killer Chiller and am soon to be adding a tune, upper and lower pulley, injectors. ethanol gauge and e85.
If I ever decide to go past this I figure i'll need to start changing out the rods and pistons to hold any more boost. Much of that is predicated on my contract being extended though.
2015 Charger SRT 392 - LMI CAI, BT Catch Can, 180 Tstat, Diablo-Modified PCM, Custom Dyno Tune - SOLD
2016 Charger Hellcat - LMI CAI, Speedlogix Catch Can, Mopar 3.09 LSD, ID 1050x, GripTec 2.75", ATI 10% Balancer, Killer Chiller, SW Long Tubes, DSS Aluminum DS, Brisk Spark Plugs, 21v BAP, 93/e85 Griff Tuned
2014 Grand Cherokee SRT - LMI CAI, SW Long Tubes, DS Catch Can, 180 T-Stat, 93 GriffTuned