which header do u guys think will give a high end output on our s2k......

 

I haven't seen any that specifically show a focus on high-end output, but I think most available headers are going to have less impact on the high-end than some proper headwork and a programmable ECU would have.
If you've seen a dyno graph from a well-tuned VAFC, you can see how much of a difference you can make by simply adjusting fuel tuning (10+ hp near redline). There should be even more gains by playing with timing, etc... if you're brave enough.

Sorry I couldn't answer your question better, but most headers on the market today are 4-2-1 headers which generally accentuate gains in the midrange. I haven't seen any 4-1 headers which would help out mainly on the top end.

 

Spoon sells a 4-1 header as does Comptech

4-1 headers are designed to provide the maximum benefit at top end.