This post is a little biased because I build the BPD rad guards. The reason I started building them is because I crushed all the stamped guards.
I don't need a tie back to the head stay. My guards are cut from solid billet. They don't flex or bend. I have tested them for 5 years. I have yet to have a side impact failure.
As for airflow. My guards will dissipate the heat off the radiator and flow much more air then a flatland guard. I don't have any bracing that runs behind the radiators. This bracing only reduces airflow and makes your installs and maintenance more time consuming and tests your patience.
I also offer the best customer service out there. If you don't like my product I will give you a refund. NO QUESTIONS ASKED.
If you still have questions or concerns check out my testimonials page on my web site:
www.bulletproofdesigns.com
Thanks,
Nate Scott
816-695-3784