The SG9 '06-'08 model was riddled with the 1410 & 2432 fault codes Marko, where the air pump could deliver moist air into cylinder #1 > corrosion.
Fortunately mine was blanked off in time.
I think you should be happy with yours, for sure.
The SG9 has slightly better power/weight but Pulse Racing has a couple of tweaks that can help yours get along that much better.
The torque curve is steep on takeoff, but it runs out of puff pretty soon after.
Overall, the Foz XT is a very respectable 'sleeper' that shocks most V8s
Very happy with its reliability too with over 174xxxKms on my '06 model.
Are your rear seats a tad uncomfortable for long trips? If I see yours, I'd like to check out if I should update anytime soon.
I keep having 'arguments' with Nick about the XT being better than his Stag - haha