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On an S13, headers are a miniml gain...the stock manifold is not that bad.
On an S14, where there's a cat at the exit of the manifold, and the header replaces all of that...there's ~5-6rwhp gains to be found.
So with that said...HotSHot is the best. Yes, they cost $300, but they are th best.
But I'd spend that same $$$ elsewhere on an S13...like I said, the stock manifold isn't bad. When you get to the +150rwhp level...then go for the little extras like a header.
- Brian
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