I have been considering Saab's recommended Hirsch upgrade for my 93 Aero
210BHP convertible. Stage one (£700+) is simply modifying the ECU software with a PPC unit which only gives an extra 20BHP, stage two (£2600+) involves a new exhaust and intercooler but gives an extra 42 BHP.Swedish company BSR seem to offer a similar ECU software upgrade via their own PPC unit which they claim gives an extra 37BHP for only £500.
Does anyone have any experience of either a Hirsch or BSR ECU upgrade?
Thanks