Subframe connectors needed or not?

12 flat or faster they are mandatory. But the torque boxes and sub frame connectors sure make a solid vehicle. If you are going to make 320 hp you don't really need anything but even in a accident they will make a big difference. If you can do it now it would be best because of future changes and the safety aspects. Also if it's a stick car or you are ever going to run slicks add a driveshaft loop.