First flight as a passenger in a Cirrus SR22-G2 - question plus photos

My friend just became a 1/3 owner of a new Cirrus SR22-G2 and took
another friend and I for a short hop down to Novato (Gnoss) from Santa
Rosa (KSTS). What a "sport scar" compared to the old 172 M that I
normally fly. I know that you all have your own opinions of the Cirrus,
so I don't feel a need to interject my own.

However I do have a question - Once while in flight, and once while
taxing, we heard and felt a distinct "clunk" come from someone forward
of the firewall. The owner said he had heard the sound once before, but
didn't know what it was (I think I would have had my A&P take a look at
it at that point, but that's just me).

So Cirrus owners... Is this clunk normal? (maybe just the castering nose
wheel "settling" -- whatever that means.)

Here are photos from yesterday's flight -
http://www.sonic.net/randyw/pics/rc/

Best,

Randy Wentzel
PPSEL KSTS