yah, noone in real life actually calls me kenchan other than my mom.
my girlfriends including my wife long time ago use to call me that while we were dating but these days they use -san.
it is common for j-folks call their co-workers with -chan or -yan especially after shortening either their first or last name. it's something about the j-culture they like to shorten names and add some kind of flare to it.
as far as the 370z's stock exhaust, it sounds better when it's leaking at the last flange. lol