I did an extensive search regimen before settling on the T/A race headers. Their street headers are a notable performance up grade, but the race headers that I settled on are IMHO have the best tube layout regarding flow and tube length of any I have seen. Half inch thick flanges, v band clamps, quality gaskets, and all hardware is included. Search my header posts in that thread for more info.
Some others are pretty and polished, but all stainless headers will turn purple/ mauve once in service. Why pay for pretty if you are intending on actually starting the car?
TIMINATOR