The factory emissions control stuff was 'designed into' the engine/trans operation. So...taking off stuff is not going to give you any significant HP increase.
Even removing the EGR won't give you more ponies. I suppose you could gain some on a turbo model by removing the cat converter, because the exhaust would be more free flowing.
But to actually gain HPs, you'll need to go the other route, and use add-on mods. So just removing, without adding, is almost pointless, young fellow.
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