04 Spec V gearbox on a p12 bellhousing, Competition Clutch Twin disk w/ custom 6 speed swap flywheel, Stock spec V axles, 24.5"X9"X13" m/t's on 13" Weld Magnums, 6.5 psi in the tires. Preloading is your friend and ive become quite good at a very hard preload and a nice quick spring off the line without just dumping the clutch. Last time out I pulled a 1.61 60ft still bogging a bit and still had 8psi in the slicks. Im sure low to mid 1.5's are doable without breaking the stock spec axles.
I was using the stock spec axles with stock b13 outer CV's last time out but im switching out the hubs and axles for the later model ones that have the larger spline and shaft all the way through just for that extra security.