I did it to my old 3.0/ manual. I did a tune and the other mods I could do short of gutting the cats. What can you expect? If your car runs REALLY good it's a noticeable difference. But not much more than that- if it's 15-20hp then that's ALL it is.
I'd say it's worth a $250-$400 investment, not a penny more. It doesn't make the 3.0 any more of a match against a fast car, in fact it doesn't even make it 'fast' . But it makes it better, a little more fun to drive. A 3.0 manual car is a decent car, and generally reliable and usually as good as the average tuned 1.8L.
Nothing wrong with it, but the 3.0 'potential' is limited. Beyond a few hundred $ and some DIY mods you are throwing money away tuning the 3.0 . Sorry, it's facts. JHM is a good company- but you'll send them $10k and get 28hp more out of your 3.0 and not even touch a 2.7L with misfires.
Want performance? Start with something different. If you like your car, do what you want- just don't have super high expectations.
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