what will have more stiffining effects on the RX. sway bars, shocks, or strut bars...

 

id say your shock and spring combo. What exactly do you mean by stiff? stiff ride or chassis stiffness.

 

shocks and springs

 

Spring rate and tire sidewall height.

 

take out the springs and insert solid metal spacers. then air up your tires to 100 pounds.

then it will be STIFF.

it will also be SLOW.

please tell us what you are actually trying to accomplish (you know, like you want it to run better on road courses or autocross or aggressive street stuff, or drag racing), then we will be able to be of help.

'looking forward to being of help,

howard coleman

 

Telling us why you need it stiff will make it easier to help you. Out of what you listed I would say shocks then swaybars then strut towers bars in order of stiffening effects.