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Old 19-04-2009, 04:09 PM
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Not sure on that one - I'm sure some of the GC8 boys will be able to give you the heads up on that one, although i haven't seen many GC8's re-mapping the OE-ECU around here, so i suspect an aftermarket ECU will be required to ensure it's all tuned up correctly.

It might be running alright on the stock ECU but a good tune will not only ensure safety to the motor but also make it so that it's not a big hit of boost and then it falls down towards the redline which it what tends to happen on untuned cars with mods with no tune.

A tune will smooth it all out so you're getting max power all the way through while running at a safe AFR. I'd expect around 180/200awkw on a 34 tuned up on a 205 around 18-20psi.
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