Where are you located and what engine mounts did you use with these headers?
Also, for those considering buying.... the Ronin 8.8 IRS is theantirotor approved! 
He used Granny's kit... lol, I asked the same question.
I hate to speak FOR him, but we've come to a tentative agreement on a 'shipped' price for the headers, as long as his estimate for shipping is close to accurate, I'll be buying the headers.
High Flow Cats are still up for grabs though!