My friend has a benen tie bar and some lower control arms hes tryin to sell for pretty cheap. Should I buy them? Would they actually help my handling or are they basically just for looks? My car is already lowered on coilovers

 

Usually the lower control arms are a little lighter than the OEM's and stiffer which helps prevent suspension flex and distortion. The tie bar will also aid in helping reduce flex and overall yes help with handling. Will you ever notice it? On the street, Probably not. But it looks good right!