There is a long 2 lane onramp on my commute where I usually gun it for fun. It is safe and usually uneventful. A couple of days ago I had a Camaro SS behind me, and he decides to do the same at the same time. He even switched to the rightlane as if to pass me. Well, he never did. I held him off till we both backed down for safety reasons once on the interstate. I only saw him gaining a bit of ground towards the end at speeds which I would not post here. This is to be expected with that 400+ hp V8 top-end.
Nevertheless, I was thoroughly impressed at how my 300 hp-ish WRX performed against the Camaro SS. Either the Camaro SS is too heavy, or the HP gap between us is not as big as it is on paper.