I wouldn't necessarily think a low-volume sports model of the Altima would put a dent in G35 sales. I'm assuming that the Altima SE-R would get some performance improvements such as more horsepower/torque, cosmetic improvements, a sportier interior, and MAYBE AWD. Even with the refresh, in terms of refinement and luxuriousness, its a few steps behind an Infiniti. And since interior changes are likely to be somewhat tacky, as they are on the Sentra SE-R, I'm sure that will be enough to steer would-be G35 buyers back to Infiniti dealerships.