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Kooks or American racing headers.

Kooks

ARH

Don't base your axle back decision on power, because the difference will be like 1-2hp so go with what sounds the best. Check out my S197 Exhaust sound thread unless you have slow internet. If you do, I'll let you know when it's safe.
 

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Long tubes and an X will in conjunction with a good tune and CAI be responsible for roughly 20-30 rhwp gains. As stated above, axle backs don't add anything worth measuring. Maybe 3 hp if you're lucky. Choose those based on sound as RF said. :)
 
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