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exhaust changes are going to be sound aesthetic (and maybe a bit of weight savings) only. Unless you are removing the cats.
So few people have tested intakes on the lgx that it's not clear what benefit they provide over stock (especially after some time for any ecu coding to adapt). Bigger filter will improve air flow and that tends to be good but beyond that....who knows.
Not sure you've looked at the engine closely but you'll notice that the "DP" can't be replaced with headers so I'm not sure what improvement you'll be looking to make over the stock pipe leading to the cats.
Nobody's really even taken these to the track yet. The overall thus-far, all your boltons that you can think of outside of a power-adder has had minimal if any effect on power. Whenever anyone has said that they can feel a difference, they come back a week later saying it's gone. Meh, lots of anecdotal he said, she said when it comes to the LGX and very little scientific testing.
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