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Anything is better then the factory manifolds. As for other brands 6 of one half a dozen of the other as far as performance you don't get all that much with shorties. The advantage is better fitment and better quality materials of the part. If you're looking at shorties they are an excellent choice.
They're ok. The Jet Hot coated ones look nice. Feels like a little more torque down low. If I didn't get them really cheap I probably wouldn't have bothered.