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Have the same on my car minus the high flow cats on an L77, got 245kw up from 212kw I think.For others considering mods using recycled HSV parts. I had my car on the Dyno the other week.
340 HSV headers, 2 1/2" HSV centre section, 100 cel cats, VCM OTR
Result was 288rwkw. Also had the trans tuned and really happy with how good the car shifts now.
Have had my ute tuned at 90,000 km. The ute was running too lean and idle too rich, warning light came on. Dyno figures varies from workshop to workshop. I am just happy that the ute is running very smooth now and warning light doesn't come on anymore. But the fuel consumption has gone up to 13.5 litre/100 km compares to 12.5 before, no wonder it was running lean and rough.