I had my VZ Cross8 done. I dynoed it before and after. All I did was get a 3.5" single system from the manifolds back with high flow cats (about $1500) and a tune ($600). It was tuned for E10 or 95, didn't want to have to buy 98.
Steve at Oztrack (in the foot of the blue mountains) tuned it for me. It wasn't dyno tuned, just tuned to a basic tune and then took it for a run. A bloke I worked with had the same thing done but he got cold air and a cam fitted and it went even better.
Attached is the before and after dyno runs. Don't take huge notice of the actual figures, remember this is awkW. The final awkW is pretty much equivalent to around 275-290 rwkW on a rear wheel drive VZ auto with exhaust and tune. Look at the gain. The car picked up 2-3mpg too. And look at how flat the torque curve ended up. Car went from a slow, thirsty thing into a real quick beast for a 2 tonne vehicle. It chirped from 1-2 on all wheels and was really good on fuel after the tune especially highway.
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