The Watt's link is probably overkill for street use. It can also add significant NVH. If he is driving on the street at the level that the Watt's link benefit is noticable then he is probably driving too fast for the street.
The STB is also felt by many to be for bling only. For me with very large front tires, 285s, and stiff suspension driven close to the limit, up to 1 G in corners, on a road course then I believe there is some benefit.
What wheel and tire upgrades have or are being done as tires significantly affect handling.
For best handling the poly/rod LCAs are a better choice but with an increase in NVH.
The LCA relocation brakets are probably required for the 1.25 drop from the Steeda Sport Springs, especially if the HP is more than stock.
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White 08 GT Roush S/C 445 HP/KDW2 285/40/18 tires/18 x 9.5 Steeda Ultralite wheels/ Steeda Competition springs/D Specs/FAYS2 Watt's Link/LCA/Adj UCA & Mnt/Upper strut mnts/GT500 Brake Kit/GT500 Front LCA/X5 Ball Jnt/Bmp Str + more
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