Somewhat unofficial.
http://blog.caranddriver.com/ring-a-din ... ring-time/
But this seems to be on par with the Z/28 based on the info we have so far.  Ford seems to have spared no expense going after the Z/28, with carbon fiber wheels.  However, I think their model strategy is interesting.  It looks like the GT350R will be more expensive than the Z/28 while the GT350 will be a little less.  The GT350 seems like an answer to the Camaro ZL1.
			
			
									
						
										
						C/D: Mustang GT350R 'Ring time
Re: C/D: Mustang GT350R 'Ring time
Sadly for Ford, they are chasing the old GM models with their new models. And being on par...with the old models.
			
			
									
						
										
						Re: C/D: Mustang GT350R 'Ring time
Well the unofficial time was 5 seconds faster than the Z/28's but the Z/28 time was all on video and the track had some partial wet sections.  So, my conclusion with all of those variables is...."on par," until we know more.