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I am assuming you mean the ARH (American Racing Headers)? If so, SLP is a nice cheaper option, but if you are looking for maximum power, generally the ARH system is good for about 10 more rwhp minimum. So you are paying for more power with the ARH system, plus the ARH system is constructed from 304 stainless, SLP is 409 stainless. 304 stainless is a more expensive material, a little bit lighter, and has better heat retaining characteristics. Also, the ARH system goes all the way back to the axle, SLP stops halfway back.
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