Meh.
Who cares what times they run individually. When they run side by side there are no excuses.
Sure, the R-Spec ran a 4.5secs but I don't think that's ever been repeated. Hell, it was slower than the SRT8 in a 3 way comparo. Same day, same time.
No doubt the GTS will wallop it around the track as well...but who cares. You love what you love, regardless what anyone else thinks!