if you dont have SAI then I guess you could use the d1 headers from Headman, but you should have them coated for two reasons.
1. it will lower you under hood temperture (a good thing)
2. anytime i ever ran plain steel tube headers i always ended up with holes burn thru to collectors.
A jet coating or ceramic coating will solve that problem and hopfuly you will have headers that will last as long as the rest of the exhaust.

 

ps. magnaflow I believe makes catback for these, and I remember seeing a highflow cat ypipe out there a few months ago... if i find it again ill post it.