I just ran my buddy's bone stock G8 GT last night. Both on low fuel, both no passengers. I have 2door 6MT with APR stage 1 tune, APR intake, running 100 octane with the 100 map.
We got on the highway and he paddle shifted to get into the proper gear...no auto lag. We started from 40 mph. I was in 3rd at about 3 grand. I initially pulled away for about half a car length, but was shifting at 6000 rpms and not really banging through gears like I should have been, so he reeled me in and were so closely matched to 130 or so. We ran a second time from zero just for laughs. I really fell on my face for first gear (stock all season tires, so big surprise there). Once I got traction in third, he pretty much maintained the 2 car lengths he had earned from the dig all the way to 120. Conclusions: 1 - I am super pumped to be running with one of the big boys. 2 - I need tires.
I believe he is 365 hp 385 torque at 3995 lb. Based on what I can estimate from APR's site is with 100 octane and intake my car may be around 280 hp 339 torque and would have slightly better hp to weight with 100 octane, but he will have the edge if i am running 93.