The dealer replaced and installed the center dual muffler and lowering springs at the same time.
The muffler sounds better than I expected and I like it.
Especially when starting up, the volume and sound pressure are loud and the bass resonates.

The lowered suspension was a setting specifically for the 990s, so I was a bit worried, but the feeling hasn't changed and there seems to be less roll.
The vehicle height has been lowered by about 15mm.

●YH from Fukuoka Prefecture (Roadster/ND)