New to the Board, but not new to Impreza's.

Mine's a MY99, like others, noticed that at times it seemed slugglish. From experience, they definitely run better on SUL. I find, when commuting in slow traffic, mine seemed to get slugglish. At first I thought I imagined this, the Dealers never found a fault with SMonitor, but if you take it for a blast (and I mean a blast), up your nearest ahem Runway!! then it blows the cobwebs away, and will definetely run better.
I'd be interested to share experiences with other Car's. I've had fun with a Saxo VTS, which I passed with some effort, and waved to the Driver, but had more difficulty with a Punto GT. These are quick, and just about matched me, hence the Car's going to Prodrive in a week for some steroids.