Does the frame need to be boxed on my 95 if I'm planning on a 800-1000 hp buildup? I'm thinking yes but I've never played with this kind of horse power before. The engine, trans, and fuel tank are all out of it right now. Would be the perfect time to do it if its necessary.

 

Dang. Tough crowd. The more I think about it boxing the frame rails alone won't do much to change the frames torsional rigidity but I'm waiting for someone to tell me I'm wrong. Seems like what I need to do is strengthen the existing cross members or add in another cross member or more angular bracing to give it some torsional strength or do like the big rigs and just let the frame flex with the torque.

 

If your going for serious autocross and road racing, I'd say boxing would help. For drag racing it would be a waste of time and extra weight, imo.