done plenty of laps on thexbox but can't do better than 9.28 so i think i'll play some more before i try it for real

the m5 is twice the engine in the 325 so it's gong to be quicker yes, but don't make the mistake of it being that much quicker than you expect because it probably won't be

you'll only shave off a small portion of time compared to what you can do in the 325 so i'd probably get to the point where i was comfortable in that i couldn't do a faster time in the condition before making the step up to the M5

and even then, i'd fel the need to do a few track days in the M5 to find a feel for where the limits are before i ventured out to the ring

for the time being, console yourself with the fact that you are faser round than jeremy clarkson