Before the update that made the S1-S kit into the S1-SE, there were tons of differences In the S2.SE.
Now, the only different is the plumbing between the filter and the rails. The s2 has a section of stainless tube.
Due to this, I have been looking at discontinuing the s2 until I update it again. I figure it will see some updates to better accommodate the new big fuel pump that is coming out soon.
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