[84GT350-1]

At what point of E.T. or horse power level is sub frame connectors and or a cage needed in a fox body. I know sub frame connectors should be used in any performance fox body. Can mid to low 12's with slicks twist up the body. I would like to do something with my 89 2.3 LX coupe, maybe a 351W or 5.0 and keep the interior stock with no roll cage. Thanks....