Spark midpipe does indeed have a stubby bit out of the front cylinder.
Makes it smaller to ship. It's held onto the rest of the midpipe with springs.
Snapped one of the retainers little arm things (so the spring fell off) down at Phillip Island but it still seals
. One day I'll weld the front part. One day.
Has been going well for the last nearly 4 years I have had it on the bike.