t-box's on p.side
I can't remember where I read it but I know I have read where people have put in a torque box on the passenger side of models that had only one. I think this was done in particular where the HP was increased as a means of dealing with any increase in torque commensurate with an engine upgrade.
I would certainly do it and if you can't find a ready made box I would make one. After dealing with mine, I don't think you would have much difficulty in making one or even fashioning something that would closely match their intent.
If I come across where I've read this I'll pass it on. I'd be surprised also if someone registered here hasn't done it already.