yep i lowered mine in 1997, 35mm front, 30mm rear.
It got rid of the wobbly lane changes on motorways so is much safer (had nightmare moment on autobahn). used eibach.
still going strong after 85000 miles.
However have lived a hard life bashing around gothenburg, the rear swing axles have both in their entirety been replaced. Mucho wonga ouch!.
apparently this is quite common with higher mileage lowered barchetta's.