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NA - G5X3 Cam, AFR heads and 4.10 gears (did it before I decided to do more road racing - still positive the car will run an easy 11 with the current setup)
A stock Z06 is capable of running 11's, mid 11's with CAI and DR's. Yeah, it is lighter and has a little better gearing, but has no where near 400 rwhp.
You need tires, gears would help greatly and you need to practice a lot. Once you start cutting some stout 60' times then add a little power to get to your goal. You DO NOT need a big cam. 375 RWHP and good driving with some sticky tires should be more than enough.
Post said C5 and mine is a slow 01 Z06 so... I went 11.89 @ 118 with Vararam, LG Pro Long Tubes and BFG DRs on chrome Z Repos with a 1.83 60:o . Went to MT ET St radials (275 45 17 on OEM Z fronts) went 11.82 @ 117 with a 1.70 60.
I agree with face, good tires in an A4 and a SC, great tune and "You can do it" water boy quote.
Dave
If you're a lousy driver, don't run slicks and drive your car every day my answer is more horsepower! I know people with a whole lot less hp than me running a whole bunch faster. :o