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I think you can gain more top end HP if you go for something with a larger diameter than SSIs, which are 1.5". To retain heat, you have 2 options: GHL headers with heater boxes or 993 heat exchangers with the flanges flipped on one side. I went the 993 HE route and the setup works well on my motor. The biggest challenge with this approach is the muffler. I have one made by M&K and a Triad, but I don't think M&K is building them any more (you may be able to buy a DIY kit from them). I like the GHL product, but when it came time to do the exhaust on my motor the funds were getting thin and I went for the more cost-effective 993 HEs.
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