Interesting thread, good power made at the top end.Im using a twin scrool s200 borg warner on my car and its a big improvement over the gt30 I previously had but stil quite laggy, im using a l8 with pectel board which is holding it back, now have a autronic sm4 ecu to fit over Christmas and then get it booked in with mark to map, so I guess il be able to let u know exactly how a more modern ecu works against a sl8, im hoping for a much better car all round, as iv had lots of starting issues, fouling plugs etc on the l8.