I think people who do underbody trays tend to see very little noticable improvement, maybe just skip that.
Reducing ride height will lower the drag from the tires, which could be a significant improvement. Supercars with their 300+ width rubber have high drag despite often having a great streamlined shape. Also having the tires more inside the wheel wells probably reduces the drag from air hitting the wheels/tires themselves, but that's only a guess.
Also, unless you hate the sound, why remove the fart pipe?
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