Never noticed lag on my Saab 9-3 Peter. But, it was a low pressure turbo, not the higher performance high pressure. The LPT just gave better performance across the rev range, from well below 2000 rpm.
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly '09 Gen2 MINI Cooper ragtop '90 LR 90 SW