Just an update. Had a tune edit and speedo recal done by Dale at CHE a week or so ago and the car is sweet as. My wife had her 1st drive in traffic/carparks etc since reflash and as soon as she walked in she said "Jeez that's a bit twitchy" and it is. Much more fun to drive. The bolt-ons and a tune are the go especialy combined with the 3.7 I've noticed the change so much 'cos unfortunately my local dealership did a software update (even though I asked them not to) on it soon after the original tune went in so the tune went back to stock. I wasn't sure at the time because had only driven it twice post tune before it was in at Holden. It's a different car now though and worth the 4k I reckon.