My expectations of XV1 are made of my experience over the last 2-3 years with Livernois with two different generations of SHO's.
On my last visit to Dearborn at Livernois, when I spone to Dan (the tuner), he told methat my current tune was much more conservative than the one I was running with my 2010. The 2010 was a non-PP with no downpipes and I ran a 12.09.
With the conservative tune and with downpipe, the 2013 (PP) ran it in 12.08 in conditions not as favorable as when I ran the 12.09.
So, XV1 is supposed to add about 30-40hp compared with stage 5 for the 2010 (with T170, 3bar, methanol). If we add another 10-15 hp for the downpipes, that should give me a good 40-50hp more than my conservative tune. On a 1/4 mile I then expect to run at least two tenths faster...
I know that Torrie has a very solid reputation and I have never run his tunes, but if ever XV1 is available one day, it should be the fastest tune out there...