A few years back Autocar pitted a Mk4 Astra Sri Turbo ( forerunner to the Gsi but only 187bhp ) against one of the last small turbo Escort Cosworths ( one of Ford's press cars ) - had a small drag race and top speed run.
As I recall, the Astra quickly pulled a lead off the mark but as the speeds rose the Escos pegged it back and pulled past. I seem to also recall that they both maxed out at about high 130s?/ maybe 137/138mph