I'm with St_za, the 3.8 really isn't a performance motor and won't respond a great deal to trying to get any more out of it. Maybe you could look at what's available in the EU as they are the same as ours.
I found a less restrictive exhaust does make a difference and they do sound pretty good. An idrive also helps a little getting it off the mark but they are what they are unfortunately.
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Cheers,
Jamie
MY15 WK2 GC Limited 3.0L. Ironman lift, bullbar & winch. Uneek rack & sliders
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