2007 3.8l v6 mods

Hi everyone, I have some questions about my wife's wrangler I just bought her, it's a 2007 3.8l v6 with 130,000 km's on it. I have just had it lifted 2 inches and fitted a set of 35's under it. Now I want to find a bit more engine power can anyone help me out with any proven engine mods/upgrades and or engine conversions ie: v6 to a v8 and better fuel economy currently only getting around 400km to a tank and running 15.5km per 100km


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2007 3.8l v6 mods