I believe it's all about the individuals budget.
I brought 3 Borla headers into South Africa, quality, flanges all seemed great quality for $585.
The gains and the rumble from this header is worth every $ for the price, including million mile warranty.
What has impressed me the most, is Borla after sales back up support. 2 of the headers gave a rattling noise after 4 months of use, I sent through a mail and video clip, within 2 days , response from Borla confirming 2 replacement headers on the way to South Africa.
We just don't see service like this over here and if this is the service delivered by Borla, IMO why spend over $200 to $400 more on a header, unless you have the extra $, your choice.
I've heard more good than bad about the Borla header on the forum. Interesting I see more complaints of waiting lengthy periods and not knowing when their headers will be delivered by other manufacturers. So each have there own problems.
I'm a extremely happy Borla customer and wonder if the other companies offer such back up service.
BIG UP TO BORLA